I bought one, we are testing it with my wife, it suited both her and me. Apparently, I will buy a second one, a useful thing.
Has pros:
It performs its function perfectly - as soon as it was put on, the shoulders immediately straightened, while the corrector itself rather guides and reminds you to keep your back straight, that is, the muscles train themselves in a natural way, and are not fixed with straps.
Has some cons:
The T-shirt wrinkles a little, but this is understandable, the corrector iSee full review