I purchased this chair for my mother who was in so much pain from her muscles and joints that she could barely walk.  In two days, her pain went from the 7-8 range to 2!  This has been a lifesaver so far.  It’s been almost a week and her pain continues to stay in the 1-3 range.  I’m hoping that, with a little more time, she’ll get to zero pain.  So far I’d say that this is one of my best purchases ever!