Well, I have 4 inside cats...so far only the one has really used it. She (Maggie Mae) goes all the way to the top to curl up and nap. Feels safe there since the others don't even try to come up. Just stand and look  up at her!!
They have "checked" it out...but no one else seems brave enough to give it a try! I thought they would love the hammock part..its like one of their window seats!

I think maybe everything is so close together that they do not have "manuvering" room, I think the bottom "step" should not be there to offer more room to get into hammock part. If they did all use it, I do not think it would take to long got them to go thru that thin carpet. Maybe something stronger like berber?  But well worth the money!!! 
Thanks so much! From my kids: Pumpkin, Lou Lou, Maggie Mae and Emme.