I have had this cat tree for about two weeks now and my 4 cats love it!  Two will usually occupy the top towers, while one (or two) others will be sleeping in the hidey hole!  They also use the sisal rope for scratching on the posts.  They don't pay much attention to the little balls anymore, although they played with them at first.  I set this tree up in my sunroom and they love to look out the windows while lounging!  It is VERY sturdy and seems well-built; took my husband about a half hour to put it together.   The price could not be beat, so I am very satisfied with my purchase.  And, my cats will usually seek out the cat tree to curl up on, rather than any of my furniture in other parts of the house, even though it is chilly in the sunroom during winter.