Ok..we thought this was neat. We got it for my son's gerbils. Problem one: the ventilation is poor and this isn't healthy for the hamster or gerbil. Problem 2: The critter will inevitably pee and poop in the tubes and wheel. What an incredible mess! Problem 3: These are NOT CAT PROOF!!! Cat's will knock them over, they will knoclk off the tubes and the wheel.

Pros: Looks neat

Cons: difficult to clean. poor ventalation, not pet proof

My hamsters loved these houses, and I really liked the outside wheel because it doesnt take up the interior housing space so there is more living space for the hammie.

Pros: great to fun, hammies love these houses

Cons: none