My cats love this! It was easy to assemble and put up.  I had to improvise based on where my studs were but it worked.  I did a 4 because we were missing parts. The two end pieces that hold the bridge were missing the connector screws for the fluffy end pieces and one of the screws for the back of the bucket were missing to attach a bracket.  Thanks to our handy hardware store we were able to find metric parts to work and still have a safe playground for my girls. I WOULD purchase again )