I have tried many self cleaning litter boxes in search of finding that right one. Overall this product works well. My young cat has adapted to it without any troubles. I really have two reasons I did not give it a five star, and I may not continue to use it. The first is the overall cost. The trays do not always last a full month, and I only have one cat. The trays are overall far more of an investment that the initial box, and the regular clumping litter is far cheaper. The other reason is that the litter trays do not control the odor at all. Immediately after switching this issue became very apparent.