I've used this about 6 or 7 times and when its on right, it does the job. But the velcro sticking to itself and the straps tangling and adjusting the backstrap up or down is frustrating. Not good for customer satisfaction. I think longer straps would help a lot, but that could be a problem in public under a shirt. However, they could give that option or design a detatchable strap extension. And the people they use to model it are young, slim, and athletic. How realistic is that.! That's not their customer base. I'm 85 years old, 6 feet and 190 pounds. If they'd create a clear, detailed video tutorial it would pay them huge profits with positive reviews. ONE DAY LATER AND I'M EDITING THIS.... I added extensions to both straps and its so much better! As I said above, it does the job once its on right. I poked two tiny holes near the end of each strap and ran a thin, strong, plastic covered wire through to make a loop about 8 inches long. Problem solved! I still maintain that moving your hand up under and behind its own armpit and then pulling up and away from your body is a pretzel yoga dexterity move that begs for a better design.
Its a pain in the .......... neck to learn how to use.