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I am asking because I tend to have limited space (less than 1 GB) and iOS 9 introduces app shrinking which I could really benefit from. Also, I always get the new iPhone on launch day and that means I won't get to experience iOS 9 on my 6+ until the new iPhone launches with it, so am I better off just installing it to enjoy a faster experience?

I could be wrong but app shrinking won't be available until release and apps are written for it? But you will save a little bit of space because iOS is a tad smaller than iOS 8.

For me I've been on iOS 9 public beta on my only iPhone (6) since it was released. Aside from some appearance bugs (which will be resolved most likely within the next build or two) it's been rock solid and runs better than 8.4.

You're mileage may vary though based on if you have apps you really need and may not work yet. And performance seems to be all over the place (like any other iOS and update.) Some have great performance, some not so much.

If you do end up trying it. Make sure to make a backup first in iTunes and archive it, so if you run into anything you can revert back.
 
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The fact that the control center would quit working on both my 6 and 6+ was enough to make me go back to 8.4. Never realized how much I used CC. They both would also stop fetching Yahoo mail suddenly, which was also annoying. Not so sure I could recommend switching to the first public beta yet.
 
iOS 9.0 Beta 3 Bug Fixes and Changes
iOS 9.0 Beta 3 Working/Partial/Not Working Apps
I recommend you check the first post of these two threads before starting try-on on your iPhone 6 Plus, since iOS 9 is still in beta phase. I would also recommend you not to install this beta software on your productivity device (I don't say primary because this may vary, while productive device is a more certain category, which indicates critical apps are running on such devices. Thus upgrading beta software requires extra attention).

And, have a nice beta testing journey! :)
 
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Hmm I see. I think I'm going to hold off on it. Thank you all for the info. Last question - do you think we'll see iOS 9 launch *before* the next iPhone comes out? Like say in early August or so? :p
I think, probably it will not. Probably although Apple only claims this fall would be the season iOS 9 goes public.
 
I went right back to 8.4. It buggy and and laggy on the 6 Plus. I hope performance will be the same as 8.4 because performance so far is a step back for a phone that's not even a year old.
 
Don't do it. There's not enough of a difference to make it worth the upgrade in comparison with the amount of bugs.
 
Only BIG Issue I have had so far is the fact that my iCloud still shows the storage of almost 10 gig from my last iOS 8 back up right before I went to the PB of iOS9, and now that I have backed up my phone since then I have exceeded my cloud storage and now I had to upgrade to the 200gig from the 20 gig because I cant delete the old iOS 8.4 back up. That back up doesnt even show in my list of storage on my phone or iPad. Called Apple and they cant delete it either. Sucks.
 
Hmm I see. I think I'm going to hold off on it. Thank you all for the info. Last question - do you think we'll see iOS 9 launch *before* the next iPhone comes out? Like say in early August or so? :p

No it will be released after the next iPhone is announced and a few days before the next iPhone is released (to spread the server hit). This is the way it has always happened, there is usually one feature or more exclusive to the new iPhone that gets revealed to be part of the new iOS when the new iPhone is announced.
 
While it's certainly not bug free I'll say that the flaws really haven't bothered me that much. (For example, I haven't had the control center issues the previous poster mentioned.)

So of course, YMMV and I'm not going to tell you that you should do it, but I'm just saying that it's been good enough for me and I'm content to keep using it for now.
 
It won't free up memory yet - but you could sync all your photos in iCloud (or dropbox) and then delete them (or reset your phone) - also delete lots of text messages. When you reboot (in ios8 or 9) it'll allocate the photo space so that it won't take up all the memory in your phone. Same problem happened to my SO, now she has space to take pictures / videos / download apps without her phone constantly telling her there's no space (and she won't upgrade to ios9 either) - right now the iCloud photo optimization is the best feature for either platform - with even better optimizations rolling out in the fall with the official ios9 I'm sure.
 
If you are a developer and need to test your app on iOS 9 to get it ready for September - sure go along, install it.
 
I guess he should've specified 'public beta' so as to avoid this type of response.

Then my answer would be "if you're willing to inform Apple of bugs that you have noticed in iOS 9 itself - not 3rd-party apps - then yes it's a good idea". Because all-in-all iOS 9 is superior to iOS 8 already.

Now, about app thinning features, I'm not completely sure it supports it already and how it works if you already have 3rd-party apps on your device. I think it needs App Store updates which should be coming in September along with iOS 9 final.
 
Then my answer would be "if you're willing to inform Apple of bugs that you have noticed in iOS 9 itself - not 3rd-party apps - then yes it's a good idea". Because all-in-all iOS 9 is superior to iOS 8 already.

Now, about app thinning features, I'm not completely sure it supports it already and how it works if you already have 3rd-party apps on your device. I think it needs App Store updates and they're coming in September along with iOS 9 final.

He's not looking for an answer like that. He seems to be looking for a yes or no with regards to performance and bugs.
 
He's not looking for an answer like that. He seems to be looking for a yes or no with regards to performance and bugs.
He specifically said he wanted to benefit from the new App Thinning features to gain more space.
 
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