Our two cats love this cat tree. Yes, the ball on the string didn't last long but everything else is perfect.  We have one cat 13 yrs. old and a 5 month old kitten. They both take turns sleeping in the box, but most of the time, they both spend their time napping and bird watching up on the top 2 levels. [...] My husband put it together and he said it was simple and all parts and equipment needed to do so was included. We are very happy with cat tree, and our cats are very happy.