I just got this on Monday, and after playing with it i think it is great. The participant doesn't
have to say anything but they do need to signal you somehow, though the method used for the signal
will fly past them. I normally stay away from tricks like this because i feel good billet technique
will always allow me to do any mind reading effect, but this one is great because you have
justification for using the card.
I do recommend this trick to anyone who wants a decent
mentalism effect.