I can actually see myself using this. There are times where certain stores have these promotions where I can buy a $30 gift card for $20, but I never bother doing it because I know that I will probably leave the gift card at home the time I come back. I also like the automatic locking feature as well when it loses the bluetooth connection with your phone.

Another benefit I see is that it doesn't actually have the credit/debit numbers printed on the card, so nobody could take a picture of your card and use it to fraudulently purchase things online.

This + Simple would be perfect.