Being relatively early in the hackintosh scene, a few things didn't work. Mainly the graphics weren't accelerated so all the nice animations in OSX looked crappy. But it afforded me the opportunity to use it as my main OS for a while before commiting to anything expensive.
I rather liked the OS and had started iPhone developing. As my vostro laptop got long in the tooth, I chose to upgrade to a MacBook Pro.
Still using that laptop today, in spite of two or three newer generations of apple laptops coming out. It's been very nice, for 32 months, no hardware issues. Last week, I've had a weird glitch where it switches to optical output when I remove headphones, and this has been annoying. I'll take it into the genius bar this weekend maybe.
Probably the nicest thing about it is that it hasn't felt it's age. In my daily usage, I doubt the experience would be any better on newer hardware than mine is now. Gaming would probably be another matter, but I generally just do casual gaming.
However, the infamous Walled Garden has been encroaching on the OSX space. That is something to give serious consideration to. It gives me pause. I've been thinking about giving linux a go again. Ubuntu has been giving me grief in vmware, but I'm going to see about dual booting.