It is nicely made. The majority of the walls have a sealant on them which makes it easy to clean up, however the backboard is not. My one cat has slipped up already and peed on it and I'm worried it will soak up the smell.

Also, there are holes on the side. Not sure why I would need to "ventilate" my litter box. The whole reason I bought it was to contain the smell. 

By far the best option out there because it is tall and wide enough, I just really hate the holes on the side. Bad engineering.