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Been workin great on my MBPro-Early2011, upgraded in-place from Mountain Lion 10.8.5.

Haven't experienced any deal-breakers at all; even with the Mail app.

Thought being an IT person, I'm very eager for the .1 fixes to come out, just for peace of mind if anything.

With all the new features, and lighter system resource footprint, I wouldn't downgrade from Mavericks for anything tho.

EDIT: I do have an issue where Virtualbox leaves a ghosted instance (on the dock, and Force Quit won't work), but this obviously is Virtualbox's issue to fix, not Mavericks.
 
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I own a 2011 MBA, and have had no issues at all on it. I'm still waiting for VirtualBox to support Mavericks on my Pro, but otherwise that install went flawlessly too.

My experiences have been pure bliss, I can use multiple monitors to my hearts content, and... use multiple monitors to my hearts content. It made me happy.
 
I've run into a couple of bugs with Mavericks with my 2012 rMBP but overall I think its been a very good upgrade for me.
 
Same here. Upgrading, not fresh install. Everything runs smooth. Only splashid safe that I found not fully compatible, and Outlook 2011 have minor lag during scrolling.


I feel like I got a new MBA after upgrading my 2012 hardware to mavericks
 
I like Mavericks just fine, but this is now the least stable Mac I've owned in decades.
 
Not a fan of Mavericks at all. Boot Camp is broken on a clean install of 10.9. Starting with 10.8.5, installing Windows, then updating to 10.9 seems to work OK. Boot times with 10.9 are slower than 10.8.5, and shutdown speeds are about the same (read: slow). There are other little things about Mavericks that bug me, too.

However, the fact that Apple has finally gotten off its rear end and provided proper OpenGL 4.0/4.1 support in Mavericks is enough to keep that OS on my machine. Hopefully 10.9.1 will sort out most of the other problems.
 
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