Standing tall(ish) at 5' 2"
I thought I had fairly good posture.  Wrong.  This device pulled my shoulders back and down--as they should be.  I know because my ballroom dance instructor and also my marathon-running instructor had told me I had my shoulders up and tense years ago.  Apparently I was unaware I still had a problem.  I'm hoping this will no only make me look better but breathe better, relax better, and avoid becoming hunchbacked as I continue to grow older.  I do not wear it all the time, but my body remembers the position my shoulders should be in.  Under the arms it sticks out, instead of flattening against my sides.  This is why I gave it only 4 stars and why I do not wear it more.  Also I find that I connect the straps much higher than in the photo.  I guess it is in almost a figure-eight, but that is the way it feels best.  I put it on and take it off by lifting my arms above my head.
Rating: 4 stars