Works really well. We still have two more layers to go. We slowed down because they are kittens and they need to get a tad bigger. The black kitty below (Sagwa) goes completely in the toilet every time. Autumn is a tad slower and still likes trying to poo on the rim itself. She is also half a pound lighter hence us slowing down to her pace. The litter makes a mess but over time they get the hang of it. They kittens love that there is water underneath. That's a game in itself. Look forward to no more litter!!
I really like the idea to train your cat to use the toilet. Overall I'm satisfied with my purchase except for the fact that it was hard to cut off the circles that make the hole bigger