Sturdy cat tree. My cat is a chubb (12lbs) and not incredibly agile but manages to get up and down this without a problem. He’s toppled a few in his time and then subsequently never uses them again. But he’s been on this daily (playing, hiding, scratching, or laid out). Great buy and 100% satisfied. It is backed into a corner for stability so I’m not sure how stable it would be if it weren’t.