This litter box does what it says it will do and thats because there is quality to its parts. The parts are hard plastic but not flinsy, its really neat to watch everything move the way it' does to make the whole thing work. I believe if put together correctly it shouldn't leave Litter anywhere it's nit supposed to. I do wipe the insides from time to time but thats me keeping everything spotless in my world. Later on We might graduate to a fancier side collecter but as for now this is just what I wanted. I have 4 nedium sized cats using this with 3 cats thst also go outside. The fourrh cat is very big at 18 lbs and he can get in and out with no problem. He can not go outside he is too big and could not run and hide. Very spacious, time saving, and works great with my favorite Super Scoop Litter.