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Zero.
Wait until the next beta, this shouldn't be publicly open IMO.

I'm pretty sure this beta isn't publicly open... I don't know for sure since I got mine through my developer account but from what I've read online, the public beta is not yet open
 
Looks like I'm going to stay away. Was really desperate to try it out though! Shame :(

How big is your internal SSD/HDD? You could always partition it if you have enough free space and install Yosemite on the new partition.

I installed mine on a fairly slow USB 2 HDD, but it seems to work just fine.
 
You simply don't want to run a beta, especially the first beta of any OS X on your main machine.

Given the OP's reliance upon his/her machine for life-crucial exams, I will agree with you, however, I would like to point out a few things:

1) This isn't even a beta. The build that Apple were running at WWDC, most likely is CLOSE to beta, and several stages ahead of the one we are provided.

2) If you read through the bug-report thread in this forum, you'll find that none of the common problems, are machine-breaking, or even problematic.

3) The BEST way to help Apple, and to gain personal knowledge about Mac OS X and how it works, is to install 'first betas' on your main machine. On a main machine, people commonly keep it up to date and free of malware. At least using your main machine, even on a newly created partition, eliminates these as a potential cause of problems.

Finally: Installing a DEVELOPER PREVIEW, especially the FIRST developer preview, is a chance that a fair percentage, if not the majority, of people in this forum, have taken, knowing the risks.

If someone who has never experienced an early Mac OS build, comes in here and asks a question regarding reliability, stability or whether or not an app works, or whether they can do this or that, the morally correct thing to do, is to help them in making a decision or assisting them in solving their problem, and not to be making a carte-blanche statement, whilst mildly insulting everyone else, for example this statement:
and not just that you can text with green bubble people.
Now that's just not helpful to anybody.

The point of this forum, and the first developer preview build, is to help Apple iron out crucial issues as soon as possible, and to help others do the same, or, at the very least, help them improve their knowledge and understanding of Mac OS X, if they CHOOSE to accept the risk of installing a rudimentary build of an unreleased operating system.

Take that same response into a Linux distro forum, and the responses you'll get will be far less mild-mannered, and far-less tame, than the one I have just given you.
 
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It's decent on my late 2013 13" rMBP, has its glitches and missing features(the call through option is glitchy as hell). But yeah, decent enough for a machine that isn't running say your business or a machine that is required for exams!
 
You simply don't want to run a beta, especially the first beta of any OS X on your main machine. The fact that you are considering it with medical school exams is just absurd in my opinion. And I would say there are a lot of great features in Yosemite to get excited about and not just that you can text with green bubble people.


He would also consider using Umbrella Corp's new, untested T-Cell virus in all his patients too......
 
Ive almost finished downloading Yosemite and wanted to know if it is 'safe' enough to use as on my main [and only] macbook 13 retina?

Is it really buggy? I really want to try it out!

Also is the Text message feature activated? and does it work with iOS 7 on my iPhone 5S? Or will I need iOS 8 for that as well

Thanks guys!

Why not create a separate partition and install in on there? That's what I've done.
 
I wouldn't suggest installing it during your exam period. There are a lot of graphics glitches, small annoyances. But it on a whole stutters quite a bit on integrated graphics on my laptop. And it can definitely get a bit hot.
During the exam period, I'm sure you'd like to avoid all these annoyances, because it can be infuriating.
 
If someone who has never experienced an early Mac OS build, comes in here and asks a question regarding reliability, stability or whether or not an app works, or whether they can do this or that, the morally correct thing to do, is to help them in making a decision or assisting them in solving their problem, and not to be making a carte-blanche statement, whilst mildly insulting everyone else.

The point of this forum, and the first developer preview build, is to help Apple iron out crucial issues as soon as possible, and to help others do the same, or, at the very least, help them improve their knowledge and understanding of Mac OS X, if they CHOOSE to accept the risk of installing a rudimentary build of an unreleased operating system.

Take that same response into a Linux distro forum, and the responses you'll get will be far less mild-mannered, and far-less tame, than the one I have just given you.

While that was a lucid and well articulated response, even beginning with agreement, and while I may have been mildly insulting in the process of my less articulated response there are a couple factors that you may have missed or misrepresented:

1. The OP didn't come here in a "I'd like to preview the OS and provide feedback to Apple, could you please help me make the correct decision" sort of way as you suggested, more what he more accurately said is "I don't want to wait for the fall release or even the public beta program to begin using a feature that I want to use".

a. As such he isn't interested or doesn't purport to being interested in providing feedback as to the OS as much as he doesn't want to wait for a feature.

b. Apple clearly states that not all features may be available at this time, so things like accepting calls, and getting SMS (non-iMessage) texts may not be supported until the fall release or close to it.

2. (space reserved for future comments)
 
While that was a lucid and well articulated response, even beginning with agreement, and while I may have been mildly insulting in the process of my less articulated response there are a couple factors that you may have missed or misrepresented:

1. The OP didn't come here in a "I'd like to preview the OS and provide feedback to Apple, could you please help me make the correct decision" sort of way as you suggested, more what he more accurately said is "I don't want to wait for the fall release or even the public beta program to begin using a feature that I want to use".

a. As such he isn't interested or doesn't purport to being interested in providing feedback as to the OS as much as he doesn't want to wait for a feature.

b. Apple clearly states that not all features may be available at this time, so things like accepting calls, and getting SMS (non-iMessage) texts may not be supported until the fall release or close to it.

2. (space reserved for future comments)


Regarding B, I believe those features specifically aren't available yet. I can't get my iPhone to connect via Bluetooth so that those features would work.
 
Plain and simple, it's stable enough for main activities. Some minor glitches and slowdowns, some compatibility issues with certain apps (only when installing, if you upgrade from mavericks they should remain fully working), but that's pretty much it.

IMO this OS is in the state in which MS would release it as release candidate or some beta 12 :D

Although if you decide to take advantage of these new features integrating iOS8 and OS X 10.10, you may encounter some more bugs, but it's partly because iOS8 is DP1 as well.
 
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Plain and simple, it's stable enough for main activities. Some minor glitches and slowdowns, some compatibility issues with certain apps (only when installing, if you upgrade from mavericks they should remain fully working), but that's pretty much it.

IMO this OS is in the state in which MS would release it as release candidate or some beta 12 :D

Although if you decide to take advantage of these new features integrating iOS8 and OS X 10.10, you may encounter some more bugs, but it's partly because iOS8 is DP1 as well.

Quite stable. It hasn't crashed on me yet, and the only issues are the graphical glitches (which remind me of the early iOS 7 betas).
 
Ive almost finished downloading Yosemite and wanted to know if it is 'safe' enough to use as on my main [and only] macbook 13 retina?

Is it really buggy? I really want to try it out!

Also is the Text message feature activated? and does it work with iOS 7 on my iPhone 5S? Or will I need iOS 8 for that as well

Thanks guys!

For me its a bit sluggish and slow but not deal breaker, besides its beta so its expected lol
 
For me its a bit sluggish and slow but not deal breaker, besides its beta so its expected lol

Again, it's not even beta.


Alpha/Developer Preview < Beta < Release Candidate < Stable (Final release).

And you could have any given number of DPs before jumping to Betas.
 
I always run Apple's earliest betas on my primary machines. Always.

Of course, I have Time Machine Backups, and I know what I'm doing.

So, tread lightly.
 
Again, it's not even beta.


Alpha/Developer Preview < Beta < Release Candidate < Stable (Final release).

And you could have any given number of DPs before jumping to Betas.

Ah ok well I see it as a beta - but yeah its run pretty decent for a alpha/developer preview ^^
 
Been using it since it was available yesterday. Safari has crashed once. I also noticed some flickering of album artwork in iTunes when I was scrolling in a window other than the active iTunes window, but I can't reproduce the problem.

Other than that, everything seems to be working well which is nice.
 
With all due respect PsykX, copy/pasting the same response across multiple threads -for example, here:
Code:
https://forums.macrumors.com/posts/19182540/

is neither helpful nor constructive.

Creating multiple threads with the same topic isn't, either.
This is a beta, this is far, far from ready for everyday use. There's nothing else to add.
 
As long as you're all backed up, I'd recommend trying it out - but just be prepared that you will want to go back to Mavericks before very long at all.

It's cool to play around with, but obviously needs a lot of work still. I can see it'll be good when it's released, but it's just not there yet - obviously, since it's still around 3 months from GM, and likely a month and a bit until beta.

Try it out if you want, but I would not recommend it for day to day use.
 
I have a side partition I'm using. Since some of my core apps (really only 2) don't work, I'm waiting. Normally I would though. It works fine enough, only some minor glitches.
 
I installed it on a separate partition and I don't feel it is ready for use a your main operating system (not surprisingly). It feels unresponsive sometimes and there are quite a few glitches (no icons showing, hangs, etc.) that make it tiresome to use. I am using a top spec 2013 rMBP 15".
 
Been running it for about 24 hours now on my retina MBP, 13", 4GB RAM. Runs maybe a tad faster than Mavericks. No major crashes yet. Some bugs here and there which are super annoying (as expected), like Finder not refreshing once I click through folders, Calendar drawing grey boxes all over my screen, etc.

But this isn't my primary machine and so far it seems okay. Word runs. Excel runs. I don't need much else. Definitely worth a look if you are a developer with a spare machine.

The UI definitely needs finessing, of course.
 
I would never test a Beta on my main machine. You will always have problems. Apps are not going to work correctly for some. Some Apps won't work at all. Safari is going to display web pages incorrectly.

I have already noticed Facebook acts funny with the new Safari. When typing in a message that's a pop-up down in the bottom the web page will scroll down by itself.

It's fun and exciting to get a new look at something that a lot of people don't have already but it has it's price.
 
Creating multiple threads with the same topic isn't, either.
This is a beta, this is far, far from ready for everyday use. There's nothing else to add.

There's plenty to add...Be a human, and respond to the original poster, specifically, and not pull an overseas call center tech support gig, by responding with a script, or, as is the case, a copy/paste.

Everyone in this forum, knows that 10.10 is very early in its life, and those that have installed it, or are tempted to, know and understand the risks.

If someone asks a question regarding an early build's day-to-day stability, I and a fair majority of others, are going to answer them appropriately, as per my experience.

However, going from thread to thread, in a forum dedicated to an early build of an as yet unreleased-to-the-public, operating system, and copy/pasting the same FUD-inducing comment, is neither helpful, nor constructive!
 
It's quite stable for a first build; the only lag i've experienced is probably due to my running it from a USB 2.0 external hard disk drive (its all I had lying around).

Experienced a few glitches with Mail when first loading it up, but it randomly started working by itself after a while.

That seems to be the biggest issue; things randomly break, then randomly work again without explanation. Few UI bugs too, but nothing machine breaking.

Handoff & Airdrop both work fine between my Mac and my iPad on iOS8 too. I would definitely call Yosemite more stable than beta 1 of iOS8.

Personally though, I'd install it on a partition instead of upgrading your existing OS version, because as minor as most of the bugs seem to be, they also seem to be completely random and unpredictable.
 
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