Purchased BioMax 450 several months ago for back pain. Using 3X per week for 10 minutes each on 2 areas has significantly reduced pain. Additional positive side effect is improved energy and feelings of wellbeing. Customer service has been top notch with quick and meaningful responses. No useless computer generated canned answers to my questions. I have had only great experiences with this product and this company. I chose this product because of all the research and information provided by this company. They did the research and built a product based on proven research. Best on the market. Thank you!