Sturdy for my fat cat. Straps to secure to wall to protect grandbaby. Fat cat immediately took to it and claws in the sisal rope. She is able to quickly scale to the top when golden retriever gets rowdy or she feels scared. The design is very stable and this 65 yr old woman had no problem assembling it by myself. Pay attention to the notes in assembly to recognize that one post slightly shorter. It is labeled. Set it aside until ready. This is the only one I found with this level of stability for one or more fat cats!!!