We recently purchased this for our puppy to keep her contained in the kitchen or bathroom when we are occupied.  She is three and a half months old now (boxer) and his yet to knock it down.  Doesn't leave any marks on the wall and is pretty strong.  

Pros: Durable 
Cons: I wish it was a little bit longer.  As you get to the outer ranges of it's length, the gate startst to weaken and bow.