Our Persian Kitten loves this! He naps in the little "house" a lot and climbs most levels, although he has not gone to the top except when we dangle a toy up there. When he is on the very top, the whole thing shakes a little. I don't think it is in danger of falling over, but I would like it to be more steady. I may attach the whole thing to a wider base to make it more steady. I wish the enclosed portion was higher. He loves to sleep in there, but sometimes our nosy dogs stick their heads in and pester him. This wouldn't happen if that part was a bit higher. The scratching posts are great! We are very pleased with the quality - overall very satisfied. A great deal for the money.