I've been riding a hybrid for about a year and a half now, and I still love it. I've got about 3600 miles on it so far, and will probably put another 2500 on it before the end of the year.
Unless your'e real into going fast, a hybrid will suit you just fine. They're slower than road bikes obviously, but the riding position is much more relaxed in my oppinion, and it's still not too difficult to do 100 miles as long as you stretch first.