We had been looking for something with height but not overly bulky and this fits the bill, plus the price is great. Priscilla (our very feisty russian black) loves the height and often sleeps on the top 2 tiers and in the little house. When she's in high gear she literally runs up and down, climbing the sisal posts, weaving back and forth through the 2 holes in the house section. It shakes a bit when she hits at full speed but seems very sturdy. She plays with the long rope and elastic attached balls a lot. She will reach over the side and smack at the ropes that attach the hammock to get it rocking and moving but but has yet to sleep in it. We are very satisfied with the purchase and it seems to have made Cilla pretty happy as well.