Our boy cat loves it..   he loves the ball on the spring...  and loves sitting on it.. and I THINK he would love it more over time.  The girl cat....well she is lazy.. and likes big spaces...  and the top shelf of the tree.. well she is TOO big for that!  They both are.   It is very sturdy system though.  I like it.  It gives them something to climb, be on and play with!  



Pros: Great value!   Sturdy, EASY to assemble.. our 5 year old helped!  
Cons: Top sea is small.. an adult cat is too big for that shelf..