Easily on my list of top 10 greatest disappointments.

When I first discovered Coin, I thought at the time that it was unfortunate I backed the project on Kickstarter later than most. It was such an exceptional idea. When it finally released, after countless delays, I couldnt help but be amazed at how horrible it was. It worked maybe once or twice, tops, since I had it. It refuses to sync. Ever. Such a waste.

Wakai-san about Coin - A smart payment device for your cards, v2.1.1