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Mojave on mid 2015 15" MBP here. Smooth and quick. IMHO, everything is great except for dark mode. Too much inconsistency and I am glad that was not my motivator to upgrade.
 
After considerable playing around, I still haven't found a compelling reason to update. Apple seems to be putting most of its resources into parts of the OS that I have little interest in. That and making access to App's internals harder. At least they didn't pull AppleScript. -That's probably 10.15

12.14 works nicely, but so does 12.13.6.
 
After considerable playing around, I still haven't found a compelling reason to update. Apple seems to be putting most of its resources into parts of the OS that I have little interest in.

Sometimes it depends on what machine you're using. For instance it's a great upgrade for me on my cMP. The included firmware upgrade is tremendous, as is the video driver for my AMD graphics card. These are my primary benefits, but also the APFS support is better. The container volumes remain better organized for me than on High Sierra. If you don't really know what I'm referring to here, it's not worth it to explain, but I personally appreciate a neatly organized filesystem.
 
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After considerable playing around, I still haven't found a compelling reason to update. Apple seems to be putting most of its resources into parts of the OS that I have little interest in. That and making access to App's internals harder. At least they didn't pull AppleScript. -That's probably 10.15

12.14 works nicely, but so does 12.13.6.

remember, too, that a lot of work goes into what's under-the-hood; general enhancements, bug fixes, etc. it's that that i care most about; i want the OS to support my work needs, my apps... and mojave is doing that really well....
 
I have a late 2015 macbook pro as well. Skipped High Sierra. Upgraded to Mojave, and I am VERY pleased with the performance, features, dark mode, etc. Great upgrade in my opinion. Not a single issue...

had exactly this experience. quite pleased with my 'new computer.'
 
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My "service battery" just returned. It's odd it disappeared after upgrading to Mojave, and behaved itself; quite normal battery length etc and now its back to being all over the place and shutting down randomly.
 
I like Mojave. Dark mode is a welcome change from white and light grey theme I've had for God knows how long. I have run into minor glitches but nothing major. Performance seems on par w/ hs.
 
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Same here. I made a decision a few years ago to run only the latest version once it has reached its final point release, so next September for Mojave for me. I do have an external SSD with Mojave installed and I am building it up and configuring to my usual likings. I will keep that updated and boot it occasionally to see how the new OS is coming along.
Best advice on the upgrade issue that I've seen.
 
I'm happily running El Capitan on my 2015 Macbook.

Only thing tempting me in Mojave is dark mode.

Did anyone upgrade on a 2015 Macbook? What's the speed like?

Running El Capitan would eventually become a security issue. Enjoy now while it last, I wished El Capitan can live on aswell.
 
I'm happily running El Capitan on my 2015 Macbook.

Only thing tempting me in Mojave is dark mode.

Did anyone upgrade on a 2015 Macbook? What's the speed like?

2012 Retina MacBook Pro. Speed is perfect. No complaints. Dark mode is the bomb. It's like I got a new computer for free.

Most tools I am using are dark mode so having Safari and the desktop and XCode dark mode is absolutely perfect.

For all the technical changes over the years, Dark Mode is the most noticeable upgrade ever. It just looks badass.

As for speed - the thing is Intel hasn't really made their processors significantly faster in the last 6 years. There's some improvements but they're marginal. 6 vs 4 cores would obviously make a difference but other than that - CPU speeds just haven't improved very much.

Look at the detailed benchmark scores of a brand new "high end" 2.9 Core i9 vs. the lowest end Intel i7 6 core processor - very different prices, and 2.3 vs 2.9 Ghz sounds like a big difference, but the actual speed difference in the benchmarks is something like 10%, if that. Both processors have turbo boost etc so they don't actually run at those frequencies. They run in a thermal envelope taking into account speed, power use, and heat. In the end they're nearly the same.

I think the lower spec ones are just made to sound worse for marketing reasons, and the higher end ones are made to sound better, but it's really pretty much almost the same thing, for a $700 price difference...
 
Does anyone know how much disk space is lost or gained with the Mojave upgrade? I've been on the fence because I don't want to lose any more disk space.
 
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