We just bought this 51" Brandice Cat Tree after hours of studying all of the competition. We picked this one because our cat is a large, 20 lb., energetic 2 yr. old who would love to have a comfortable perch to look out the window from and to look down on the room, and mainly to have a comfortable nap. It had to be very sturdy, and have a variety of things to do. This unit delivers all this and more! There is a 'bonus' wooly blanket in the bottom condo and top bed included ! It is VERY sturdy ! On day two, our cat jumped from a nearby chair arm to the top bed! We thought it would shake and fall over. But it didn't even vibrate! It weighs 80 lbs! no wonder! Plenty of scratching posts and places to explore! Does NOT need to be secured to the wall. We placed the bottom 'hammock' in the middle, to be more safe from her jumping into it from the top level ! BUY IT!!