I've just finished my first year with a Mac (G5 iMac, OS X Tiger with a gig of memory) and quite frankly, it's brilliant. Wierd for a couple of weeks while you find out where everything is, then if you want to just use a computer it's getting near perfection.
If you're a hobbyist who wants to build it, tweak the hardware and rebuild it again, then it's probably not for you. Personally I have to faff around with the bl**dy things all day at work, when I get home I want my computer to just work. And it does
