I was loaned an Arc by my daughter, who had it purchased for use on her mare. I have fibromyalgia, degenerative disease of the spine, COPD, nerve damage, chronic pain, angina and I am very overweight. Pain medication helps to ease the pain but after using the borrowed appliance for two weeks the pain is easier to cope with and my attitude has changed. I am actually feeling optimistic again and interested in life instead of simply living with pain and total despondency.