I absolutely love our cat genie, I will never use another litter box. That being said, there is one little problem that keeps me from giving it a full 5 star review. As many people have mentioned, It sometimes misses little pieces of poop, and then it smells horrible. This happens rarely, although it seems to happen less when the box is on cat activation. It is not enough of a problem to keep me from loving this box, but it would be nice if it didn't happen.