I have 2 adult cats and they have no interest in this condo. However, it is well made and designed. I have 3 kittens over the weekend and they really liked it. I had read few reviews that had mentioned the fact that adult cats (mine are 1 year old) do not accept this toy, but thought that might cats will get used to it since it looked like a lot of fun. I think that if you have small cats, do not hesitate to purchase one. They will most likely us it even once they grow up. This is also a big structure and now taking up quite a lot of room in my house. It needs to be given away.