I am so impressed with the Irene 21” Kitty Cube Cat Condo. My grey cat is 18 lbs, so it very hard to find cat trees sturdy enough to hold his weight, especially when he jumps up onto them. He’s 11 years old, so climbing and jumping with all the extra weight is hard for him to do, however he had no trouble navigating this condo. He already broke one cat tree and hurt himself so he’s Leary of them now. This is solid as a rock. The other cat is 14 lbs. so I needed something that fit both and it had to be well built to handle both cats. I don’t know which one they love more, the condo or the box it’s shipped in, either way it’s certainly worth the cost. I fully recommend it for those who have rowdy chunky big boys. This condo is only found on Wayfair.