I live in Japan but I don't use it. It would save me about 5 seconds on each my infrequent non-internet transactions, and that's about it. The pre-paid debit c

I live in Japan but I don't use it. It would save me about 5 seconds on each my infrequent non-internet transactions, and that's about it. The pre-paid debit card function (shown in the left pic in the article) is more useful, though. Because you can use it for small payments, you don't have to be carrying lots of coins all the time. And in some places there are exclusive cashiers for these debit-cards so you can check-out much faster.