You won't be able to get a mug with the voucher unless you've got a newbie CM who doesn't know better. However, if you're careful with the menu, you should still be able to get your money's worth. Ironically we ate at FQ, but this was the one place we didn't use a voucher. If you haven't checked out other restaurants at the resorts, it is a very FUN part of the trip.
POFQ was great. We both loved the quietness of it. My 4 yrs LOVED the pool. We biked over to POR one day to swim at ol man island (we brought our own bikes), but the water was a little too cool for our spoiled bodies. Plus, the layout was just busier...if that makes sense. Enjoy your trip.