I did the math for our next trip in August. I compared the DDP to the TIW card discount on what we would actually order (i.e. I didn't include appetizers since they are extra on DDP, but I also only included the few desserts we'd actually order if we weren't on DDP.) We actually saved quite a bit on DDP, so it's worth it for us. However, we're a 2 person family, we drink mostly water, we do eat a CS and a TS each day. We don't usually have snacks and end up leaving for home with lots left on our cards. In spite of all that, we came out ahead on DDP. And it's easier to use.