The quality could have been of a better grade instead of using pressed wood or fiber board, solid wood delivers greater stability, easier clean up and safer, more durable sub-surface beneath the carpeted areas that the pets come into contact with. In addition, a better grade of carpet should have been used because I have noticed after frequent vacuuming, this fabric developed thin spots whereas surface areas are beginning to thin due to the poor grade of carpet or fabric used and the lack of bond or adhesion of the pressed wood and the fabric glued & stapled to it.  Also, the surface areas are best suited to accommodate smaller felines less than ten pounds or for kittens only.  I am being generous giving four stars.