I have to admit I thought it was going to break when I used it to help me move from a second floor apartment into a house. So many boxes that I couldn't remember were stacked so heavily on top of each other that I thought they were about to break. But to my surprise, he touches the 1st floor every time with no problem. The only complaint I have is that there isn't a lot of soft materials on the wheels so there's a loud bang at every stair climb. But otherwise I have absolutely nothing to complain about.