The best part about them(for me), is that they're small and lightweight. They will do what larger tools do, but you don't get tired from holding a 3 pound drill(even 3 pounds can kill your arm after a while!)..and they're very easy to maneuver. Just an FYI...Harbor freight sells a great set of attachments for Dremels..
http://www.harborfreight.com/diamond...-pc-69653.html
and they sell an off-brand for $9.99...might be a great way to start. I have the attachments, but can't comment one way or another on their off brand tool, I don't have that one..but for 10 bucks...not too much of a risk.