My cat loves this!  He plays with the toy on the bottom and uses the scratching post (maybe this will save the couch!!).  His favorite though is to climb up the outside of the sphere and sit on top - he is the King of the World! He loves playing around the hole on top and reaching for his toys that have been dropped inside. After a week he has yet to go inside but he is getting great play value out of the sphere - who knew?  It was easy to assemble and very attractive in my living room - received lots of compliments!