Well, if I use the card as the equivalent of $100, I'm paying a 7% surcharge. Not really there yet to be used as a medium of exchange. Maybe when prices go to $1/card.
Discussion
It may cost a few dollars, but it's a "device" and a protective case that costs to manufacture. Anyway, it's still definitely cheaper than the average hardware wallet and insanely more secure than the average software wallet. For small payments like $100 dollars I think it's better lightning. SATSCARD is great for a gift idea, bigger sums and also don't forget that you can re-use it up to ten times. So when you are passing it to somebody, the counterparty must understand that there are more than 1 slot and that benefit should be included in the transaction, I think.