LOVE this cat tree. My cat immediately started climbing all over it, playing with the hanging ball toy, and eventually settling in for a cozy nap on the top perch. The roost and the cubby area are a bit small, but my cat has no problem fitting (she is about 11 pounds), and I think she actual quite enjoys the tighter quarters. The tree feels sturdy and the materials are nice/cat approved. There are no formal instructions for assembly, but rather a diagram showing how the pieces fit together with a note that the tree should be assembled from the bottom up. No additional tools are needed for assembly. Definitely recommend!