One of our 3 cats is a "tree" cat and uses the top perch, and we bought this specifically for him. He weighs abour 13-14 pounds and doesn't rock the tree when jumping up.  Very sturdy, well made product and easy to assemble.  We did remove the round unit attached under the second highest perch to make it easier for our other 2 cats - especially the 14 year old - to progress up the levels.   Nice product; glad we bought it. Gets a lot of use.