We have 3 young adult Indoor cats. The tiny cat tree we had was great for kitten use, but it was no place for an adult cat nevermind 3. Exercise was also an issue since our place is not very large. I found this Tree to be the perfect size for adult cats to run and climb over. There is no chance of it tipping over. All 3 of my cats can play on it at once with plenty of room. The design of the useable space is wonderful and even the quality was good. It's impossible to find anything as good as this without paying twice as much. It is now their jungle gym, resting perches and scratching posts all rolled into 1. Definately one of the best purchases I've ever made for my cats.