I bought one of those six or eight months ago and didn't notice anything other than burn marks that left scars. I did not use it round the clock, but wore it all day for a couple of weeks. I've read (on competing web sites) that the design of the penny zapper is not really effective, but I haven't studied it enough to know the ins and outs of any of them. It might be worth another try, now that I've done some liver cleansing. I'm seeing a bodyworker who has been telling me about a new one she's getting, and has been putting off the purchase because it's around $350. She said I could borrow it, so I will have to find out more about that one. thanks for posting your experiences with it.