I bought this cat tree for my 9 mo old kitten, India, and it was very easy to assemble.  My 8 year old son and I did it in about 45 minutes.  As we were building it, India was instantly curious..she couldn't wait to sniff and make it hers! Once completely assembled, it fit nicely into a corner of my apartment by the back sliding glass door so that she can sit on top and look outside.  Great quality item and the hanging rope and hanging mouse toy is a nice plus.  

Pros: Easy to assemble, quality parts
Cons: Not sure if she will really be able to use the tunnel due to the placement but I may try to use it another way