My experience with 10.7/8 made me a little nervous, but Mavericks is absolutely screaming on my 2013 MBA - I'm getting better battery life, everything I've used so far is still rock solid, and I'm also super enjoying full screen multi-monitor support - by far the thing that I wanted most.
Downloading it today on my 2010 17" MBP.
Given the bloated and expensive nightmare that Windows 8.1 still remains, it's both refreshing to receive the latest OS X free, and have it work nicely out of the box. I'm sure there are bugs to be ironed out, but this was the earliest I've ever adopted an OS X revision and so far, the happiest I've been.
Downloading it today on my 2010 17" MBP.
Given the bloated and expensive nightmare that Windows 8.1 still remains, it's both refreshing to receive the latest OS X free, and have it work nicely out of the box. I'm sure there are bugs to be ironed out, but this was the earliest I've ever adopted an OS X revision and so far, the happiest I've been.