Just received the Cefaly Dual (approved by FDA Nov 2017). 1st setting is for Acute (100 hz @ 60 min) to treat a migraine. 2nd setting is Preventative (50 hz @ 20 min) to use daily. So far I have used it twice (I've had it 3-days but had to charge it and read the instructions the first night). As with other's posts, my initial experience has been intense! Unlike the instructions that describe a sensation of your hair standing on end, I have felt extreme pressure in my forehead, particularly between my eyes and a very strong tingling sensation into my eyes and eyelids. On the first day, the tingling was primarily into my right eye and not so much my eye lid. The pressure in my head was intense and I felt like there were tiny hammers pounding on my forehead. I did eventually hit the button to stabilize the intensity and prevent it from further increasing and made it the entire 20 minutes. I felt fine afterwards, however, while I have always had tinnitus (ringing in my ears) it seemed worse that day. My second treatment was similar but more intense. I let the intensity increase higher than day 1, but eventually did stabilize it. During this treatment I noticed the intense tingling in both eyes AND eyelids. No way could I open my eyes to do anything, so I relaxed. Further into the tx. I felt like my forehead muscles were actually moving around. It's crazy but it's almost as if there is this little battlefield on your forehead where all of this crazy activity is going on and then it's over. I'm not sure how people work, read, etc. while using the device, unless the tx gets easier over time. Don't be afraid to try it! The point of sharing this is that there is no mention of this in the literature. And when your trying the device and suddenly feel all of these strange sensations, you may find some peace in knowing that others have experienced what you may be experiencing and you won't be alarmed. A few other things worth mentioning. I've had migraines since my early teens. They run in my family. I've tried beta blockers, calcium blockers, antidepressants, supplements, massage, acupuncture, biofeedback. 100 mg Immitrix tabs and injections are my salvation. I've been hospitalized numerous times. I hit menopause 5 years ago and they got worse. This past August I had an acute attack and had them daily for almost a month. I went on 100 mg Topamax/daily. It has worked well, and I average 3-5 migraines/mo. and the side effects are annoying. (Stomach issues, tingling in toes, edginess) Unfortunately, I live in the OH river Valley and have always lived close to this region, which is notoriously bad for migraines. When I'm out West, I'm almost...almost migraine free! Since moving isn't an option right now, maybe the Cefaly will work. Will keep you posted!