re: All your credit cards in one - Coin

awesome idea but a few things i can think of:

while it uses your regular cc, i can see businesses being confused and refusing to accept it as a form of payment; it doesn't have your name or an expiration or a ccid or even a card number on it.

you still need all of your cards to purchase stuff online or even some stores ask for an expiration or the last 4 to confirm your id

do you trust it enough to not malfunction when you are carrying it and not your other cards

some hacker will probably find a way to allow a waiter or anyone to dump all of your cc info to their phone

it seems like it would be really sensitive to damage

i really don't like the idea that it emits a bluetooth signal potentially radiating my entire credit information to anyone in the area.

eta: i see it shows last 4/exp.
also if it goes out of range it deactivates. it claims to have a range of 80ft, but if its like any of my other bluetooth devices that's more like 10ft.