We have three cats, two of whom are quite large.  The base of this cat tree is very solid so when the cats jump on the top perch it supports them.  They don't play on it like I thought they would, but they do sit on it to relax in the sun.  I notice that they also use the scratching posts quite frequently too.  It wasn't nearly as difficult to put together as we thought it would be.  It is also nice looking so it can be in the living room without being an eyesore.