I am enjoying this product! When I use this I get a pressure across the forehead (which seems to last all day). Tingling in the temples and some sensation in the face. The first couple of times I heard 3 soft clicks from inside of my head. Afterward, I saw into the room I was in (the first time) then I see several random locations that I'm not familiar with. Since using I've reacted to some things just prior to them happening without knowing. Coincidence? Maybe.