This was very easy to put together. My cats (2) absolutely love it! They love sleeping and playing at the very top. The only reason I did not give this 5 stars is because of the bottom design. The ledges that are below the round platform at the top do not protrude. My cats are still young and cannot jump to that platform and because the others don't stick out in any way, they can't get to the top. I placed it in an area where I have a short wall divider that they are able to jump up on in order to get up. I m sure once they get bigger they will be able to jump up to it. Also, I think that the string used for the toys at the top could have been stronger and attached to the toys in a different manner. They were pulled off within the first day. That wasn't that big of a deal because now they play with the toy on the floor. I would still recommend this piece for the quality, size and price.