The McDVoice survey usually rewards participants with free food items or discounts, such as a buy-one-get-one-free offer or a free sandwich with purchase. The exact reward may vary depending on location and current promotions. These incentives encourage customers to return to McDonald’s while making the short survey worth the effort. While rewards are modest, frequent McDonald’s customers find them valuable. Always check the receipt or survey instructions to understand the reward terms and expiration date.