This cat tree is very sturdy. It does not tip over or even wobble when my cat jumps on it. So, for that it gets 5 stars. Unfortunately, the suggested assembly does not allow enough room for a cat to jump from one shelf to another. The instructions show the taller of the two round perches should be placed on the 2nd level, but the space between the roof (4rd level) and the top of the taller round perch is only about 6" and is not high enough to permit a cat to jump up. So, we assembled this using the shorter perch on level 2. Problem is that the taller perch won't fit on level 1 (ground) because the rim hits the 2nd shelf in such a way that you can't tighten it down.