Bad advice.
The first 30 days means nothing, as my G5 ran excellent for the first 5-6 months. Now, even after playing all the silly games of swapping memory, running disk utilities, wiping drives, to find out what's wrong, my machine is a piece of junk. Constant crashes and my only recourse is to take it to an Apple store. I'm 3 days under the one year warranty, but bought AppleCare 2-3 months ago, when the problems really started happening. Good thing I did, because I'm going to need it.
Same goes for my work machine (2.3DC); worked like a charm the first few months, now slow and cranky. Not as bad as the machine at home, but completely unnacceptable from high priced machinery.
The forums are great for advice and helping you know where you went wrong, but when you didn't go wrong and Apple did, they're useless.
Consider AppleCare a little more thoroughly. You have a year from the date you bought it to judge whether or not the machines is going to be a pain in the *ss.
-Vincent