Originally I tested one at a Barrett-Jackson show in Las Vegas in 2021. I was surprised and impressed. I bought two and never regretted it, we use them at home frequently. This massager has done more for my back than a professional chiropractor has ever done. About 10-15 minutes in it and the pain is gone, I can get up and work again. Over the last couple of years I bought three more as gifts to others and am giving one to my girlfriend this Christmas. I really can't get over how well such a simple looking product has turned out to be better than anything my medical provider has done for me in this regard.