We really like this tree.  We have two active cats who get into a lot of trouble.  I hope that this tree will provide some distraction.  My cats are small to medium sized, and the bigger one takes up all of the high tower shelves.  I would think cats over 10 lbs might have trouble using those features.  The towers also tend to sway a tiny bit, which freaked my cats out at first, but they got used to it and use the shelves now.  One cat constantly sleeps in the small cubby.  The toys that came with it fell apart in literally hours, so plan to replace them, but that's no big deal.  This is a BIG unit, so plan for it to take up some space.  When assembling, pay close attention to short vs. long screws; they are interchangeable, and if you use a short one in the wrong place, you have to take the whole thing apart to find it.  [...]easy assembly.  Great value!