I have had my mac laptop for going on 6 years now. The only thing that is truely wrong with it is the battery no longer holds a charge. It's slowed down quite a bit, sure, but I am definately a mac lover.
I bought a pc desktop about a year ago and it's had problems from the start. It's still usable but randomly shuts off, the video card and motherboard had to be replaced and it still has trouble on occasions.