The tree is sturdy enough to with stand the rambunctious playing of my two male kittens - 7 months old. As previously reported in other critiques, the poor little mouse lasted about a half hour before being torn off, but everything else is intact. Both of the kittens prefer the level with the rounded top that has an edge to it, so if I were to change anything, it would be to add an edge to the top level as well. They both pretty much ignore the ladder and play house, preferring the top levels to sit and watch out the window.

Pros: Sturdy