I purchased this for two calico cats, one is about 10 lbs and the other is 15 lbs. The cat tree is very sturdy and I've never had any issues with it tipping. The cats really like the top shelf and enjoy playing with the box at the bottom. The ball escapes quickly, but sometimes I will scatter some treats inside. They enjoy searching for the treats. Both cats like perching on the top shelf, but they don't really use the other shelves since they are kind of small. The cats will typically jump from our windowsill to the top shelf and bypass the others altogether. The smaller cat fits into the cat bed, but it is way to small for the larger cat. The tree can work for larger cats if they like to perch, but some of the other features will be of no use to them. They both love the scratching posts and use them on a daily basis. The tree is still looking good after about 3 months.