The scratching post is very stable on a large area. I can not imagine that cats get him upset me.
The cats can be up to a small area which is quite small for adult cats. The middle area provides enough space for the fattest cat in the cave, it is for him again a little tight. Can be scratched at three different columns, which is made by our cats very diligently.
At first also still hung a ball on the scratching post, which has, however, did not survive long. After a short time he had holes and the filling foam came out. We then cut him.