They're great if you need something that's very portable. There are caveats, however.
#1 - The keyboards are
small. Don't expect to do any significant amount of touch typing without pulling your hair out after a while. My girlfriend got around this by getting a small/cheap USB keyboard that she sets in front of the netbook, and that works great, but having an external keyboard plugged in may not fit your situation.
#2 - The displays are small. Plan on doing a lot of scrolling.
#3 - No optical drive. This usually isn't much of a problem for everyday use, but loading up your favorite apps could be problematic if you don't have an external CD/DVD drive or a home network setup so that you can install stuff from a disc in another machine.
#4 - Lack of horsepower. These aren't high-end gaming machines - or even close. Some even have Atom processors. Doesn't sound like a problem for you based on your OP, but I thought I'd throw it in there for others that might be reading.
If those are all limitations that you can deal with, then they're great. The main thing is the keyboard. Most people don't realize just how small they are, and they expect that they're going to replace their full size laptop with the netbook - and quickly change their mind.