I am not a great puzzler, that being said…it took me a very long time to put it together. The cubby at the bottom is pretty loose…could be my lack of workwomanship. Parts are sturdy and structure is nice looking. Pressboard pieces are nicely finished. “Antibiosic ultrasonic” carpets and coverings seem rugged. I’m going to try tightening up the cubical once more, it’s the least solid piece and very difficult to reach and accomplish. There isn’t much swing to the swing tunnel. I haven’t introduced my cat to it yet, so her opinion remains to be determined! As cat towers go, it’s a nice looking piece.