Great idea but seemed impossible to understand.
I bought this with my roborovski in mind as he loves to dig. Unfortunately, the size meant that he was not only scared stiff by the height but couldn't seem to understand that he could dig up and down it. Okay, never mind, let's try my Syrian. Similiar issue in that she couldn't understand its function; she is also very large so can't fit out of the bottom. Good idea but didn't work for me - I may try converting it into a hide. Bit of an expensive mistake though :(