There has been many times, when I presented the GW and the other (QC) cards, and they say, (the sales staff), er, um, excuse me, but we don't accept that card, would you like to pay by other means? (!!!)...
Because, you have to tap with the visa/mastercard side facing downwards, so the FF membership side is facing upwards, and I have to keep explaining that its a prepaid visa/mastercard, and can be used at EFTPOS terminals.
It even happened at a Stamford Hotel.
One thing I would love to have had, is that if the VAFF card/GW card, had the bar coded line coming down, like the QC card, so that I could just present the card at VA checkin, instead of having to check in with an ipod, and face that downwards onto the VA gate scanner.
Then having to turn ipod and wifi device off before getting onto the plane.