I have had excellent results with the zapper. I passed visible, 1 inch or longer, parasites when I first used it. Over a period of a month of use I had a cyst which look like a cancerous tumor I had seen on a web site go down to a mearly swollen looking area. It's gone down about three fourths in size or if I had to give measurements I would say it was about 1 and a half inch to about a half inch. It no longer throbs. I discontinued my zapper throughout christmas and it's not gotten large again even though my treatment wasn't complete. I know that one day it will be completly gone without surgery thanks to the use of the zapper and the removal of toxins had to be involved. I also used to have continually itching skin which would keep me up nights. Sometimes even wake me up. That's gone now too. My skin has always been oily so dry skin wasn't the problem.
Since my results have lasted several months now I'd say that isn't a placebo effect.
I hope this encourages you to take the step and buy one. I thought so well of them I gave 4 away as christmas gifts.