I wish I had ordered this when my cats were kittens.  I have three grown cats and they all love laying on the top shelf and playing with the top ball on a string and scratching the bottom post.  But, the highest perch and the little round cubby they wont even investigate.  I think they are too big to feel comfortable.  First I had it against the wall and they ignored it.  Then I moved it to my sliding glass door and now they use it much more.  They like looking out over the yard.