Works for my cats with different needs. Have not found anything to replace this yet.
I have a cat with kidney disease. So she pees a lot. And another cat that refused to use corn litter because the litter pieces were too big. This works for both of them most of the time. Clamps well, small pieces. It does track out of litter box though. Once in a while it gets stuck to paws of the cat that pees a lot. But that can be cleaned up.