I have 2 cats..one is smaller and more active one is big..overweight and more sedentary.  They are about 8 yrs old and i made sure to get ramps for my big girl..They both love it..and big girl doesnt really even use the ramps so it has increased her activity..since she jumps up there more.  They both use it everyday and love it. THey have been all over it. We got a new small puppy breed dog and i wanted them to have a place they could hang out and not be bothered. It is great they love it and it even has toys that came with it and hang from it. I could not ask for anything better. I am very pleased.