I am very satisfied with this cat tree. When I first built it I was afraid my cats wouldn't use it because they continued to use their older cat trees that night and I thought the cat beds at the very top may be too small (2 of my cats are overweight). The next day though, all 3 were using it, 2 of them were using the top cat tree, one of those cats weighs 17 lbs and was able to curl up and fit into it. The top box is a little small, but my cats still find ways to fit into it so I am definitely glad I bought this for them. Their previous cat tree's only had room for 2 to sleep on at a time, so this is great!