Mat, you are absolutely right...the bio disc is only a energy device. I have been using the bio disc and the chi pendant for over 12 months and I have definitely felt a great improvement in my wellness and my son's immune system - especially on his asthma. I don't think USD600 is a lot considering the benefits and effects on a person. Private Health Cover cost more than that a year in Australia . I guess the question is what is your health really worth.