This product is EXCELLENT!  VERY easy to assemble, VERY sturdy, and VERY attractive.  My cats took to it right away!  They had fun crawling in it even while assembling, it is "hands down" their all-time favorite place to be!  Since there's more than one perch, it's perfect for multiple cats.  My two Ragdoll cats can now both be up high and on a perch at the same time.  The little cubby's are fun for them, as well as the pop-pom dangling balls. If they feel like "sharpening their nails" --they do it on the posts of this climber and not on furnature.  Absolutely no negatives --this is a fabulous product!