So what kind of experiences do you guys have that own the 2010 Air? I updated Mountain Lion some time ago and have to my machine has become unusably slow with ML. I even reinstalled the OS, but that didn't help. Browsing the internet seems to be too tough of a task for the computer. I perhaps could understand what is going if I had the 2 gb model, but I have 4 gigs. And I even upgraded the processor to 1.6 Ghz. The computer is just about two years old and I have to say I expected to get more out of this machine. I know this isn't a powerhouse, but things were just fine in Lion. If 10.8.2 fix these issues I probably need to revert back to Lion, which would be too bad as my iMac runs ML just fine (well, it is an 2011 i7 so it should) and then I'd loose iCloud syncing.