I am writing this review for others cats sake. Because my cat is absolutely happy with this product. Other cats have to feel the same.
I read a lot of reviews before making decision which cat tree I will buy. And my choice was right.
It's really very well-made product, very sturdy and all of the active sections are useful and can be used. All baskets are big enough for adult cat to sit and sleep in. Upper basket is very fluffy and soft, good quality of materials. Easy to assemble. 
Could not be happier