Super easy to put together and the perfect height for what I wanted, unfortunately no one has gotten onto the top yet on their own accord and haven't stayed when I put them there. Hopefully, one of them will decide they like the top. The bottom was checked out immediately and has been used even by my big guy who really is too big for the bottom as seen in the picture. The bottom is a perfect size for my more normal sized cats though. I wish the pads were a little thicker especially for the price of this item. It is heavier than I anticipated and seems very well made.