The problem with the iCache was that it was very short lived, and once apple moved away from the 30pin connector, the icache folks never updated their case for

The problem with the iCache was that it was very short lived, and once apple moved away from the 30pin connector, the icache folks never updated their case for the smaller form factor or new connector configuration. My iCache is now sitting in a drawer with a bunch of other "good tech gone old," but, I've had issues with servers understanding what my iCache card was, had Enterprise Rent-A-Car flat-out refuse to rent a car unless they could see the raised digits on a card, and a shit-ton of other things. I was lucky -- I didn't have any issues with the actual encoding on the card (apparently, there were some folks from kickstarter who couldn't use it at all), but, I'll deal with the five cards in my wallet and generally be happy about it.