PocketSand11
macrumors 6502a
Mavericks works better than Mountain Lion, though. My MBA from 2012 is working better than it ever did before. I'm even using the beta of Yosemite. But Mavericks was definitely a step up from ML, which was a step up from Lion. Better battery life, better performance, when comparing Mavericks to ML.
I tried it on both my Macs, and it was a disaster. Same for all my family members and friends. The common factor was that we all had HDDs, not SSDs. I think Mavericks accesses the hard drive a lot more than it should, and that's not noticeable on new Macs with SSDs.