First the good. It’s well made and I like that you can tighten it securely but . . .
I am a size small woman with a small waist and wide hips and it does not fit well. It must be designed for people with a straight body type. My target area for use is the lower lumbar/sacrum area - it does not stay in place. It rides up my spine to fit the torso/thoracic area which is NOT the intended area.
Also it restricts movement which can be good if you stand all the time. But as soon as I sit down it rides up. I reached down for something it rides up or bend just slightly and it rides up. And yes I do secure it very tight.
Thus the three stars because I won’t get much use with it, and the reasons stated.