Well we have already gotten rid of this and are back to the old litter box. Our two cats had no problem adjusting to it. However, the cartrdiges needed to be replaced in about a week, and are quite pricey. Also the raking mechanism which I referred to as the poop zamboni often missed deposits and left them there, or got them caught up in the rake, not pretty. In the end this was a very expensive product that was not worth it for us.