My little cat (she's three months) LOVES this cat tree.  She snoozes inside the different condo components, and she likes to climb to the tippy top to get a break from my older, bigger cat.  

The only complaint I have is that my older guy cannot enjoy it so much, because he's too big to stretch out and be comfortable. He is a medium-large kitty, about 14 pounds... but he mainly stays off of this cat tree because most of the perches and play-spots are not big enough for him.