I used them and personally they work for 5 minutes, then my sweat wins. They might work if you only have mild sweat, but for those of us who produce more than most, they aren't what they claim to be. I didn't even find them to be very good picks in general, they wore down quite fast. I bought some real carbon fiber picks from ebay that need no scoring and won't slip out of your hand. Best of all, they are hard as hell and last for months.