I have been using this device for a month now, and wow, am I impressed! I have migraines so bad that hit suddenly, and so intense, that they drop me to the floor. They last for days. Days of blinding pain. I tried this because my insurance company offered it for free. I didn't expect it to work. I expected it not to do a thing. While it has not removed my migraines, it has lessened the intensity of them, and can shorten the duration. Combined with other preventative treatments, it has knocked my severe headaches down to 1-4 a month. Extra bonus - I have an advanced case of Ehlers-Danlos Syndrome. I live with constant pain. This has helped reduce my body pain for a short while as well! This device has improved my quality of life, and I am happy for such.