Putting this together was a little annoying.  I had difficulty lining up the pet cube and getting the screw to catch the threads.  The platform the pet cube sits on could be a little larger and it is a little difficult for my cat to get from the pet cube onto the top seat.  The cat tree is really cute but a little awkwardly designed.  All that said, however, my cat does love it and the mouse toy hanging from it is now her favorite toy.