We have only had the product a little over a week but so far, so good. I purchased it for my arthritic aches/pains, as well as to see if it may help my wife's migraines. While the results are still TBD, the device was easy to use, caused no unwanted effects. My wifes said that she hasn't noticed a difference in migraine yet, but did feel that it may have helped her sleep a bit better having it under her pillow (used before bed and when she woke up in middle of the night).
The company was wonderful to work with and when I purchased the wrong item they made sure it was corrected before shipping, helping me get the device that was best for my needs.