For all of the hype from other reviews about how their cats loved this tower, I'm wondering what is wrong with my cats.  Neither are interested at all.  Is it the smell  One is old, one is young.  One is little, one is large.  After several months, it sill sits in my living room unused and is close to being stored in the garage for some future kitty that will someday join our family.  It was easy to put together and seems quite sturdy - two stars.