My cat loves it!!! She was checking out the parts before my husband could put it together. The first thing she did was jump up to the tier with the mouse to bat at it and later got up on top to look out the window.
My skeptical husband thought that it was sturdy and well-made. It took about 10 minutes to erect due to the ease of it, and all the required tools came with it. Probably meant for a cat not over 10 pounds.