What about bars? A lot of bars I go to hold onto your card until you tab out. I'd hate to keep getting notifications about losing my card every time I'm out on the town. When you go back up to the bar, they ask what your name is to tab out. I didn't see anything on the Coin to do that. I also wouldn't want the bartender to press the button and change to a business account or something similar.

I'm not being a hater, this is just an occurrence where this might not work well. I still think it's an awesome idea though, and I'd like to get one.