I had all of the pieces out on my living room floor, not even put together, and my cats were loving it! I have three cats, two are about a year and extremely playful, and one much older one that likes to just lounge around and be left alone all day. The two younger ones love to go all over this thing - they chase each other on it and when they tucker themselves out they fall asleep on it. My older cat loves the two cubicles and it is now where she is 99% of the time.

Putting it together was easy, a little time consuming but that's to be expected when you have something this huge, but regardless it was easy enough.

My cats are not a fan of the hammock at the very bottom - probably just too unsteady for their liking, and they don't find much use from the ladder, but aside from that both me and my cats love this product.