[georgebonnr]

I agree with others - I love the concept. However, I think for customers who are less enthusiastic and trusting in general, having a physical representation of their card built before their eyes will make them more acutely aware of the information that they're sharing, and be nervous that they're sharing it (even if they have limited reason to be nervous). In short, it will spook average customers. Maybe for a site that sold to a technology-focused crowd it would have more success though. Just my hunch.