Yes, I was one of those persons whose strap let go. I was carrying a montagnana pattern cello in a Bobelock oversize case ( read: pretty heavy) and the cello case, released at the shoulder, went headfirst onto a wooden floor with an awful crack. I was able to grab the strap and stop some of the fall. Fortunately nothing happened. I am now NEVER without safety straps on any case I own. A lot more peace of mind, for sure. These have a good diameter, so they’ll fit on almost any setup. I recommend them...