I've used one for almost a year now, here's couple of things I've noticed.
A regular notebook HD (4800/5200 rpm) is slow compared to a desktop HD. There are 2.5" 7200 rpm drives. Get one and problem is solved.
Some notebooks have loud fans. They might not be loud when you check out the nootebook the first time, but after listening to it for 10 hours a day it becomes annoying. Fans make more and more noice over time, so make sure you get a silent one from the beginning.
Other than that, I'm very happy with it
