The reason you can't get an answer is because this has turned into a "Ford vs. Chevy" type of competition . Unfortunately , because of the standing of the zapper in the FDA controlled universe we can't get any reliable feedback from entities such as Consumer Reports , epinions.com or the like - too bad . It would be nice if we could trust the persons who are manufacturing these devices but , due to their relationships to said devices their opinions are automatically suspect a la "Caveat Emptor" .Could they honestly tell you their product was useless? Ironically , I tend to be accepting to what these guys are saying and just have yet to act on purchasing one . I suspect I'll have to just buy one and see if it actually does anything . I did follow the tendollarwhatever. com link below which took me to ebay where I got into the feedback . There I emailed one of the previous purchasers of his device and the person did respond stating that she had noticed some improvements in her health . I don't really know what to believe anymore . You'll just have to try one . Therefore I suggest starting cheaper and working your way up as you can afford it . This is what I'm going to do . It's like going to a candy store and buying something you've never tasted before . If you don't like it you can't get a refund because you've taken a bite out of it! :~) Go for it - it's not that much money !