I have 4 adult cats, one of which is about 15 lbs and a few years old. I've had this for a few months now and they have loved it. The cubbies are large enough for my big adult cats. They love to sleep in them and the hammock type things. Unfortunately the hammock on the left side that doesn't have anything above it, my cat broke because he was too heavy. The whole part above that cubbie on the left side just broke off and stripped the screws so I can no longer use it. Besides that it has been well loved and the rope is almost all the way off the bottom posts so I plan on buying more rope to just wrap back around them. It was a little difficult to put together even with 2 people but I find all cat trees difficult to put together. I do highly suggest this cat tree especially if you have large adult cats! If you have kittens forget those smaller cat trees and just get this one, no need to buy another one because they won't outgrow this one!