Bought this and a larger one. Placed this beside the larger one to assist the cats when going between levels on larger unit or getting off as it is straight up and down and doesn't allow that to happen easily. After buying both units 1 cat has claimed the area and doesn't even use this unit. It went together easily is sturdy and seems comfy just not tall enough to please cat to see out window or interest it. Giving a good rating on the unit itself as it is nice for a smaller one.