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Rock solid 10.8.5 on my Mac Pro 5,1 at home, 10.9.5 on the 4,1 at work. May go to 10.9.5 at home since it's working pretty well at work, but will have an image ready to go back if needed. Late 2011 MBP is on 10.10.5.
 
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MP3,1 is on 10.6.8 still, wouldn't dream of changing that for audio production, until the wheels finally fall off (hopefully never!)

rMBP2012 is still on Mavericks, really dreading the next machine i get having the flat designed-OS. it just feels stressful to me to use them (and ios since 6.) call me old school. it's not that i'm a huge fan of rabid skeuomorphism (eg leather address book), but i'm even less of a fan of the overuse of bright white and hidden features, and very ambiguous + similar looking icons everywhere when it comes to interface design.
 
I hung out on 10.6.8 a long, long time. From there I went directly to 10.8.5, and I only JUST (about two weeks ago) went to 10.9.5 on my 4,1 --> 5,1 Mac Pro. I use Adobe CS (currently CS6) for video, animation and photography, and can't have crashes ruin my work, so I keep where stability and performance mix. I have a 6-core CPU, AMD Radeon R9 280x, and an Areca card running my RAID6, and I'm pleased with it in Mavericks. It was fine in Mountain Lion, but I got an extra 512GB SSD, and thought I might as well try 10.9.5. If problems surface, I can go back to 10.8.5 in seconds.

I'm also pretty sure my next machine will be a self-built PC. I just don't believe Apple will make another Mac Pro, and if they do, it won't be able to run a nice hardware RAID that works as well as my Areca setup.

I have a 2012 15" MBP with 10.9.5, too. It's been my test kit for Mavericks, which was what let me go ahead with the Mac Pro. I have dual SSDs in that, and may try the new MacOS on it, but only for fun. It's perfect on 10.9.5 now.
 
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heck I still have power mac's running 10.3.9 and a G5 running 10.5.8 and a 17 inch 06 MacBook pro with 10.6.8. Mac pro's running newer OS versions
 
I hope they're not on the Internet :(
Any home router with NAT provides a pretty good firewall against random threats from the outside.

Of course, if you run an old browser or unpatched app on the system, you've given the internet cesspool an open invitation to come in.
 
I haven't gone past Mavericks and don't plan to due to expensive software I would need to upgrade which is pointless to do until we confirm what the nMP will or won't be this year. If it's a loser then back to windows along with corresponding upgraded applications.

...After Effects broke which I use 99% of the time.

I still need to teach myself that at some point. Any sites or tutorials you recommend?
 
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Snow Leopard on 2010 13" MacBook Pro; El Capitan on 2016 11" MacBook Air. I moved internet finance and shopping to the Air. I moved surfing main news sites from 2012 iPad Mini to the Air. Snow Leopard continues to be main box for photos and iTunes purchases and non-news internet consumption. I use FireFox on Snow Leopard. Like others here, I do not like the flat UI. I doubt if I will upgrade the Air to Sierra.
 
Mavericks works just fine with my applications (Painter, Adobe CS6 mainly) so there's no reason to rock the boat just so I can get the latest emoji's. I'm rocking this as my last Apple system as long as I can (Dual 6-Core 3.46). If I have to get a new computer before I retire, it may be a Z.
 
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10.6 Snow Leopard was great. What every OS update should be like. Lasted 2 years.

10.7 Lion was the beginning of OS X becoming unstable. They messed with the file system (with the autosave/history feature) and everything just cascaded from there. Annual releases by the calendar, no matter if they're ready for prime-time.
 
@developer12345, they do have more control/leverage over developers than regular users, as developers need their stuff to work on the latest and greatest--typically. Its regrettable that they do this.
 
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@developer12345, they do have more control/leverage over developers than regular users, as developers need their stuff to work on the latest and greatest--typically. Its regrettable that they do this.
Unfortunately, as newer versions of my apps force adopting system upgrades, that's pushing my stable software/system setup off a cliff.

I actually have newer versions of some software I don't run, because the combo is not stable.

I feel like Hodor, but less hopeful.
 
10.6 Snow Leopard was great. What every OS update should be like. Lasted 2 years.

10.7 Lion was the beginning of OS X becoming unstable. They messed with the file system (with the autosave/history feature) and everything just cascaded from there. Annual releases by the calendar, no matter if they're ready for prime-time.

Yes, you are absolutely right, the mess started with Lion. We had a huge problem moving big files on our network in my company couple of years ago, cMPs with Lion 10.7 were soooo slow and full of bugs.

I am typing this from my cMP at work, which has been rock-solid and it is still on 10.6.8, I use a MBA and my iPhone on the road. My MBA has Yosemite (needed iOS integration). My home cMP is on Mavericks, because of the dual monitor setup. I went from Snow Leopard to Mavericks in Feb 2016 and it has been stable.

Overall, Snow Leopard and Mavericks are very stable, no issues at all. Yosemite is a no-go for me for work, I use it for email, music and movies only (and this is my work laptop lol)
 
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I stay with Mavericks, not for some issues in later versions. No, I simply don't need all the gimmicks,
what we get in every new system.
To name some I don't need:
Appstore, Lauchpad, Dashboard, Resume, Autosave, Dictation, Facebook and Twitter integration, GameCenter,
iCloud, Notification center, Maps, Receive/make calls with Mac via iPhone, Handoff, Fullscreen,
Photos.app install not optional, Mail Drop, iCloud Drive, Siri, Apple Pay, Unlock by Apple Watch,
Spotlight Web integration, Universal iCloud Clipboard, such a poor Preview.app...

On the other side, what I would prefer for example:
Modular developement, install what I really want, not all gimmicks into one full integration with tens of system services I never need, Developement not only for the latest OS while the older ones are handled like trash,
Further Facetime developement, example stream selected video, photos, files,
privacy developements like simple PGP management,
Safari developement for all OS X systems, not only for the last 3 years,
Safari more features, more user options, cookie management etc,
new filesystem, Clone bootable smart backup feature in Disk utilities,
Itunes parted in different Apps: Store, Mediaplayer, Synctool, all optional install
A small PhotoEditor and viewer app like Irfan View for Win, based on files, not on databases.
A new Quicktime.app with H265 codec and window without controls in it, a small Video application like iMovie 6HD
and so on
I know, 99% are thinking different, now you tell me, go back to Snow Leopard...
If I could yes, but a rollback is not possible with newer computers, the core system is out of development, Safari and security outdated.
;)
 
I upgrade within the first few days of availability of every new version of OS X/macOS.

Same here, basically as soon as a new web driver is available from NVIDIA I will upgrade. It's the only way to stay current with web driver updates/fixes.
 
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I have an aging audio interface that "supports" but has issues with El Capitan. The last El Capitan update screwed up Outlook Mail(stalls) but I have no problem when I boot into W7. I haven't heard back from MS about it. I'm in no hurry to upgrade to Sierra.
 
I have a 2010 Mac Pro so just about managed to get Sierra. I have that installed on my 'normal' SSD and have Mavericks installed on my music production SSD.
 
I wish I could stay on Mavericks, but the application and also feature to dial phone call from mac are important too. I am now on El Capitan and not interested in 10.12 (at least for now).
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Snow Leopard in a virtual machine runs faster than native current OS on my MBP. Sad. I hate how Apple tries to force you update, esp if you have an iphone.

I have MBP 2011 with Snow Leopard and still running fast (even with standard HDD & RAM).
 
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