Six cats....six happy customers! From the 6 pounder to the 18 pounder, they all love this tower. The tube with the cut out is especially popular. The top bed is also a winner, when one curls up in it you can't see them, its got a nice depth. It was a snap to assemble, only took a few minutes. The quality is stellar, its sturdy and well built. We have 7 towers, as well as wall mounted units, and this one is another winner. The only problem for us is that these carpet covered towers don't last as long as we'd like, as our cats love to dig in their nails and scratch it.