Bests & Worsts Reviews from Amazon

So thankful I purchased this. I had experience with a smaller, less powerful unit bought at CVS, but even that was helpful. This TENS unit is a lifesaver for me in helping to manage my pain issues. The best part is that you can set it and then there are safety covers that protect the unit, so you don't have to worry about settings being accidentally changed while wearing. I often wear it on continuous mode for hours, even leaving the house with it all strapped on and hidden under my clothing. It has been a God-send. In my opinion, this device is more effective than pain medications and muscle relaxers (for those of us who have built up a tolerance to medications), and is certainly less toxic to the system. If you're wondering if this is powerful enough, this is one strong little unit that runs on a single 9 volt battery. I never set this higher than about 3.5 and it goes up to 8! You can set it as gentle or strong as you want. You can choose different modes and tweak adjustments. I purchased a set of rechargeable 9 volt batteries with a small recharging unit and I honestly can't believe how long the batteries last. (EBL 840 9V Battery Charger with 4 Pack 600mAh Li-ion Rechargeable 9 Volt Batteries) UPDATE Aug. 2017: I've used this unit for 4 months and it got me through a really horrible time where I was suffering from knotted shoulders and trapezius with terrible trigger points that were so bad I was unable to sleep on either shoulder for nearly 4 full months. The pain radiated down into my upper arms and it felt like I needed rotator cuff surgery due to the muscles all cramping so much. I was seeking chiropractic and massage therapy once a week and taking pain meds around the clock. I finally had to have cortisone injections in 5 major trigger points, but the ONLY thing that truly helped break the cycle of pain and get me through the worst of it before the cortisone was this TENS machine. I can not recommend this unit enough for those suffering from pain. UPDATE Sept. 2017: Well, unfortunately, the unit quit working a few days before I had to travel, so I was forced to buy another one to replace it. The digital display all works, it cycles through everything, but the wires and pads do nothing. I even tried the wires and pads from my new unit, but to no avail. Although I had to wait a month to go through the manufacturer, I was fully refunded for the product and my new one works fine. My original review was 5 stars, dropped to 3 while I waited for a refund, and am leaving it at 4 stars because the seller did take care of the issue and the new unit seems to be working fine (although I did just get it a month ago). I will update if anything changes, but I still stand by the fact that it is a terrific unit when it works!