As of this September I work a regular job 32 hours a week (not being too productive today though!) and attend law school part-time in the evening.
So, obviously, I needed a laptop. I wound up choosing the MBP so I could get a larger screen, and then just sold my iMac to make it my only computer.
I like to mess around in garage band a lot (although i don't have a whole lot of time for that now) and play the occasional game, so the extra power, larger screen and all the other niceties that the MBP entails were worth if for me.
It seemed a little silly to have both machines, so I sold my iMac to my mom, who was looking to upgrade from her original lampshade iMac.
I'm fortunate enough to be going to school on a full scholarship, so unlike most law school students, I have actual disposable income.
Certainly, it would be a lot nicer to just have the ultra-svelte, 3 pound MBA in my bag for typing notes in class, with my iMac at home for all the other stuff, instead of my 5.5 pound MBP for both.
But it is what it is, so I'm not going to go to the time and expense to get that set-up now.