I have worn the shirt for a few days now. Usually, I feel my posture is more upright, relaxed, with less lower back pain than I usually have. It is not magic. I must keep my shoulders upright, and keep from slouching, which I tend to do. Still, it seems a great help in correcting my posture. I have to do the work, but the shirt helps greatly.
Bottom Line: Yes, I would recommend this to a friend