When I owned my mac, I was always pleased with their coverage on their warranties. I got the extended warranty for both my laptop and my ipods. They're more than happy to replace broken parts. Any troubles I ever had were covered. I owned the powerbook, and it does overheat because its an aluminum casing. They had to replace the bottom casing cause it warped from the heat. Also the bevels in the top would lose their threading and pop out sometimes, so they replaced the top screen completely.
I remember having hard drive problems as well, which they fixed.
Macs are good for that kind of thing.
Glad to hear they could help you out.