This little machine truly has improved my life. I have a rare form of migraine which targets one specific point on my face. Although I have medicine, it takes a few hours to kick in so I am still frequently losing time to my very distracting pain. However, I've found that using the TENS on my face every day has significantly lowered my chances of getting my migraine. If I forget to use it two days in a row, I often get a migraine on the third day. I try not to forget!This is obviously anecdotal See full review