As useful as teats on a bull. Won't work at all with my main address (complains that my postal code cannot be found, despite never prompting me to enter it). Finally registered with a second email address, but the "use in restaurant" coupons refuse to display, and so they cannot be used. I would have ordered with the app, but the it forces you to order the fries and drink to be the same size as each other, and many of the drink selections are missing from the app.