Photo Booths

My maid of honor was recently at a wedding where they had a photo booth. She said it was an absolute blast...it was unlimited pictures for guests, they were given two sets: one for them and one for the guest book. I am a picture person and I love this idea however, my fiance thinks no one would use it. Both our families are crazy fun and I think they would. It is also a little pricy...so I guess I was wondering what people thought of that idea, or if anyone has every experienced them...just let me know...Thanks!!