They are terribly cute. We have a litter of buns at the Humane Society right now.
However, they're a LOT of work, moreso than cats, IMO. They are much harder to litter train than cats (who don't really need training). They're also really sensitive to a lot of things, so you've got to be careful with their diets, make sure they don't get scared or frightened, clean their hutches all the time, check for parasites (if they go outside), etc. Most people just shut them in a hutch all the time, but just like other pets they really deserve attention so that they aren't frightened of humans all their lives, and they also need to see a vet regularly just like other pets.