My friend looked at many, many Cat Condo's reading reviews.  This one received many reviews, and this one pretty much needed for our Sydney.  We based a lot on a review the owner had two cats and said this one worked.  Space was a factor for us and our cat is only nine pounds so we felt this condo was acceptable.  It was easy to assemble, especially when you read the instructions!  I was a bit surprise
to find that most of the parts were so small.  Sydney is a bit hesitant about climbing on it, but she is getting better.  If she does not out grow
it and she is two so she should not do that.  I would advise any one considering this to check the measurement closely