It works!!
I ordered the large/extra large posture corrector because I knew it was adjustable and would work better for me.  I was correct.  I have only been using it as directed for a couple of weeks now, but I feel it is helping with my posture and with the pain I have in my upper back.  I plan to keep using it because I think it is also helping with my walking since I'm standing up straighter.  I would buy it again.
Rating: 5 stars