I really love the idea of having a self cleaning litter box to keep my house cleaner and less work for me. I really really wish that the tray was a solid plastic or came with a solid plastic tray option as my cats urine a lot and in the same spot and sometimes hit the edge so if the cardboard were to get wet it will get really gross and messy fast. I really think that crystal litter absorbing the urine is a great solution but I find the crystal litter to be a lot more tracking vs my normal clay litter. The box is also smaller than my cats are used to so the likelihood that they will  mess over the side is much higher. I think this is a great option for young cats and kittens to be trained on to use, but older cats like mine can be set in their ways and not want to use new litter. I would also recommend a really good litter trapping mat.