When the cat tree arrived my son close his door and put it together. Both of my cats started playing and jumping on it. The youngest  loves the cat tree and when I am looking for her guess where she is at. She stays on the cat tree and I smile. The cat  tree but what was so  funny she kept hitting the hanging ball like she was a boxer. For a minute that is what I thought she was,but back to reality. She continue to keep hitting the ball until it came off. Then she puts in my room where she sleeps,but overall it is a good purchase.  It is stable didn't seem to fall over after I pulled alittle on the two top ones. But they both it and I am very happy.