I have had this for over a year now. I use it and feel better and then forget I have it until I start becoming depressed again or I stumble upon it. When I use it and turn it up too high it does become irritating at my temples. Its not so much painful as it is irritating and I want to hurry the session along. I am so glad I have this. It should be good for life. I cant imagine it ever becoming irrelivent. So glad my chiropractor took the time to help me get this. The only other tbing that bugs me is the strap that comes with the headband. I am always fighting with the pads popping out of the headband because its not wide enough to hold it in place. Other than these minor issues this is a good product.