Easy to redeem at jtb (domestic terminal). Mention when you will use it coz they will stamp the date for you. Easy to use at all bus at okinawa main island, just show it to the driver. No need to fuss with coins

Easy exchanging pass. Just take 5-10 minutes. The exchanging counter is easy to find and the staff can speak English quite good. You need to check for the exchanging counter open time before exchange. Be sure to print the reservation document.