First, what a fantastic deal on these products.  I'm telling all my friends about this site.

Second, and just as important - a solid, easy to build, and seemingly well made product.  The package was heavy but well packed.  I set it up myself, which is a bonus.  Although I have it in a corner, I sensed no issue with it tipping or leaning.  My kittens especially love the area above the little 'house' to sleep. It's a great solution to their climbing instincts and for those claws.