At first our cats (kittens) were interested in this, especially the dangling ball. However, I don't know why, but they soon lost interest. Once in a while they'll play on/in this but not often. It's hard for them to get to the top. Because it's too high to make it in a single leap and not staggered they have to use their claws to latch on to the top and pull themselves up. Construction was easy, took maybe 10 minutes.