I will use this as a backup to my paper wallet. Huge advantage over a laser engraved steel card is its reusable. If you need to sweep your wallet you would have to throw your cryptobit card or bitkee away. With this you can generate a new address and arrange your letters accordingly.
But then a negative is you can't bip38 encrypt it.
He didn't really address the issue that there is no incentive for people to pay in btc at amazon or wherever. We don't care if they save money on fees. But with our CC we get cash back rewards. So amazon would need to start giving at least 1% off there invoice to us.