Fun but nearly useless

They say 80+% acceptance rate, which in my experience is quite accurate. This means I still need to carry all my cards—plus this one—so I can make a payment the other 20-% of the time.
I wouldnt mind that so much if the Coin would work when, as they promise, its in proximity with my iPhone. I find it VERY annoying that I must pull out my phone and launch the Coin app just to get my cards to appear on the Coin card.

Troyjoy about Coin - A smart payment device for your cards, v2.0.5