My cats love their new cat tree!  It was very easy to put together.  All parts are labeled.  Once together, it's very sturdy, even when my heavy cats are on the highest perch, batting at the ball.  Top perches do move a little bit, but that's to be expected, given the height, and I have no worries about the stability.  It took a week or so for my cats to venture on the tree by themselves.  I sprinkled catnip on it, which helped.  Now I often find one in the house, while one has staked out the 2nd highest perch as her own to best see out the window.  Great purchase and a great price!