Yeah...this effect looks cool in the App Store, but not so much when you actually perform it. As a previous reviewer has mentioned, having to ask the spectator their card, then "input" that info to the device, is a dead giveaway, no matter how smooth you do it. One of my friends was initially fooled, though another immediately knew what was going on. The effect "iforce" is much better, much cleaner and seems more spontaneous.