My cats love this cat tree. The biggest one barely fits in the condo part, but he's squeezed in and napped in there. All three love the mouse at the top and they take turns being in the top lounge area. The busy box aspect has fallen out of favor with them, but I think it's because they're enjoying the rest of it. They love scratching it, sleeping in/on it, and playing on it. I'm thrilled to find something to satisfy all three.