I would have given this item five stars except that for my two 15 pound cats, I had to brace the bottom shelves that stand out at the sides because I was afraid that if they both hit one side at the same time in one of their full-tilt 'chases', it might tip.  I just put a crate under one side (that was in the floor anyway- and a scratching post that was the perfect size under the other and now they can race thru the house and jump on at the same time and NO WORRIES.  They love the tree and all its shelves and cubbies.  I love the great Wayfair service.