i had feeder rats on it and i really liked that there was no dust & no pee spots on the bottom of the tank so it was absorbing pee very well. there was also no smell even with having 5 rats in the tank at one time.
i'd give it a 10 on a 1-10 scale but...i wouldnt use it for a pet cuz i cant imagine the stuff is comfortable on little feet long term.