Two of my boards use the Demon knobs. I like that they don't block the artwork or ice up. They grip great. I've had one set on a board for three years and the other one for one year. I've never had one come off. It sounds to me like the previous reviewer did not clean his board before applying the knobs. Wipe your board down with some isopropyl alcohol in the area you plan to mount them and you'll have no problems. I'll buy they again.
What use is a stomp pad on the mountain when I can remove them using only my thumb and forefinger? This product may be visually appealing but functionally it's worthless, unless you want to use them to decorate your frig or something.