I bought a MacBook for school this past summer. I love it, I've always wanted a Mac, and I'm glad I put the money down. I bought the 15", but if I had to do it over again I probably would have bought the 12". The 15" is wonderful, but I use my desktop PC at home and have no reason to carry around a giant laptop for school.
I'm sure it'll come in handy when I move out in a few years, though.
The only downside I've faced with this computer is the unibody-keyboard. I spilled a tablespoon of cranberry juice into the computer, and to fix it as Apple wanted to, it would have ran about $600.00 even under warranty.
Instead, I got the keys replaced individually and that was free.
