With concerns about functionality and comfort - I got the 2 pack anyway...
It worked like a charm, once I figured out how best to wear it. I am 5 months pregnant so a low back evening gown was no going anywhere without a some undergarment support. It was mostly comfortable but needed some periodic adjustment. On a normal day... would have been no trouble.

The hooks were not perfectly aligned with my vanity fair brazier, but nudged together just slightly and fit fine. the strap must be kept LOW to properly convert a mid-back strap to a low back strap, and it helps to have a buddy to work on the adjustments between converter band length and shoulder strap length.

This is a good item to have in the arsenal of underwear accessories.