First things first, this tower was super easy to put together. My roommate and I put it together within 30 minutes. As soon as we assembled it we knew there was something off about the top tower. It was very wobbly no matter how tight we made the screw at the bottom. Over the next couple of weeks it got looser and looser and there was nothing we could do. Then about 3 weeks later it completely fell off. Now, our cats enjoyed it for sure but weren't as interactive with it as we thought. They basically only used the house area, the mouse toys, and the top towers. This is based on the experience of having two cats. One cat is a 4 year old chill dude that sleeps a lot, average weight, the other is a kitten about 5 months old full of energy. The kitten did use the ball box on occasion but usually just pulled the balls out of the box and played with them on the ground. The hammock and rope were not even touched.