These products are great. they are sturdy and heavy enough for even a bigger cat. they are also easy to put together. however, this item has one flaw. it's a corner piece that doesn't fit into a corner. we tried both constructions (two are shown in the instructions) and neither fit. A was narrower and B was sturdier. we kept B. great bargain for the price and we solved the problem of size by switching another kitty condo from this manufacturer into the space so no harm done. just realize that there are better ones that they make for small spaces and corners.