It works!
I have noticed that I have lately been slumping while working at home on my laptop computer. When I mentioned this to my daughter, she told me about the posture corrector.  It definitely does the job. While it is adjustable, it doesn't need to be pulling tight on my shoulders.  Finding a comfortable position took a while, but with a little pull and tug, I got it on.  I find that it keeps my shoulders back just enough to keep me in a comfortable upright position.  Wearing it regularly has made me more aware of my posture and reminds me to sit and stand straight.  Definitely working for me!
Rating: 4 stars