Bests & Worsts Reviews from Amazon

We bought this strap because of the 4+ star review and was excited to receive it in our warehouse which we occasionally need to move heavy items from 200- 300 lb item with 2 men up a flight of stairs. Followed the instruction to the letter. Pick up the item up alright just as pictured. As we walked up stairs, the locking mechanism for the person on top of the stairs slipped. Most of the weight dropped to the person below and I had to take the harness off quick to rescue the guy at the bottom. Tried it again with another piece with the same result. Returned for safety concern. I am surprised this company has not been sued to the ground yet.