yes, i have used one and i love it. it is for real and useful. i have not used it int he manner the website says, but i see no reason for it not to work. buy one and play with it. put it under your pillow a couple of nights. that will prove you have something there. also, put a glass of water on it and set another identical glass and water to the side so it wont effect it. come back a couple of hours later and taste test.