I agree with sloppy donkey - people either tend to love or hate them. However, I've experienced some rabbits that I absolutely love, and some that just don't work well with my anatomy, so I think it's a matter of finding one that suits your individual body. They can be downright uncomfortable if you pick the wrong one, but unfortunately there's no way to know for sure before you buy.
i'm not too much of a fan of rabbits. i've been told thats mostly because i haven't fond the right one, but really, i'm not willing to try a dozen different ones to find one i like, when there are so many other types of toys i want to try out