Did not work for me in a car
I am sure this product has helped many people sit in office chairs, but I needed it for my car. The pictures show people sitting beautifully straight with unsupported backs. I've never seen anyone sit like that while driving a car. I think it would be really helpful for backjoy to make a video of someone using it in a car. Including images (drawings) showing how their back is curved while sitting in a car. It did not work for me, and I don't see how it can work. I am updating my review to honor the care and concern shown in the response by the company.