We just came back from WDW. I feel the Q&C vouchers are not particular good values in most of the restaurants allowed, except for Beaches & Cream and Pepper Market. However, for B&C, they don't allow a separate side, and we did not care for the food at Pepper Market too much. Other places, we came out ahead maybe a couple of dollars. But the bottomline is, if we were ordering on our own, we may not order desserts and drinks (we bring our own bottle water), so net net I am not sure if this is good value. BYW, I did not care for the waitress we had at B&C.
On the other hand, I love the kingdom lunch vouchers. To use one adult and 1 child vouchers at the Rainforest Cafe is excellant value, also, we used 2 adult vouchers at Chef de France, great food, good service. We did not share meals, I felt funny asking so it cost us more than what we could really eat, lots of leftover.