As someone who's been actively involved in engineering Bluetooth LE devices, believe me, with constant daily usage, it will NOT last 2 years. There are so many factors involved with BLE, not just limited to usage, but with respect to range, environmental conditions, etc.

What's your point? None

I actually forgot to add something to my original critique: if your device (iPhone) dies, and Coin isn't authenticated you can't use your card(s)!! Haha

Can't believe I missed this. There's another bullet of flaws to add.

Their FAQ is vague and doesn't really answer any questions, especially the important ones. They attempt to give clever and confronting responses to serious questions and most people can see right through that. Comments on their FAQ like "Should last" and "a lot can happen between now and Summer 2014" - get out here. If you want customers to pay (a premium) for an experimental product - be concrete and firm.