I have owned the Infrasound 8 [Latest Version is CHI Palm] for many years, about 10 I believe. I keep it next my livingroom recliner and use it daily in whatever place I may have pain on any certain day. I have Fibromagalia and this machine has been very effective in reducing my pain level. I most recently suffered tendonitis in my foot and used the Infrasound for two days and the pain was seriously reduced. This machine has increased my immune system and is instrumental my ability to lead a relatively pain free life. I am a 73-year-old female and am very grateful for the Sound Vitality Company. I am still in contact with them if ever I have a question or need advice.  4 out of 5 stars

Kathryn Morgan