I bought an Archie & Oscar tower in the past & was very happy with it.  Same deal for this one.  Easy to put together and very sturdy.  It does wobble a little bit when the cats are up way high, but it doesn't deter them in the least.  This particular model was so great for us b/c it offers a lot of cat tower in very limited space.  We had a very narrow place we needed to put the tower and despite the height & many levels, the tower takes up very little floor space.  The ONLY thing that keeps me from giving it 5 stars is the fabric.  I am not a fan of the faux fleece b/c it holds cat hair terribly & is difficult to vacuum.