OS X? Unimpressive.
I’ve been working with a MacBook Pro and OS X 10.8.2, and I have to say I’m not impressed. Coming from a background that consisted almost entirely of Windows and Linux, it isn’t all it’s cracked up to be. It’s still another OS with it’s own set of problems.
That said, the user interface is more consistent and usable, in a lot of cases, than Windows and especially Linux desktop environments.