We needed something big and sturdy for our full size cats (15 pounds). This works but not without some help -- the posts, especially the middle one, are too wobbly. The cats want to scratch on it and climb it but the wobble turns them off.  I screwed them in as far as they can go but I had to add "L" braces and 8 screws to eliminate the wobble on the middle post. The cats love it now. The shorter posts have less wobble but I may add braces to those as well.