we've tried the DXDP, DDP and QSP and have enjoyed them all.
Having 4 children (3 of who are now "adults") it worked great!
I don't have to look at that $4.00 price on a snack and cringe. You want it? Sure! It's you're snack for the day.
We really enjoyed the QSP this last trip. Each person got 2 snacks a day and then the QS meals. We had some GREAT food... but we did have a car and were able to drive to different resorts to try different food out.
We always do the DDP when we bring MIL/FIL with us. No need to worry about sticker shock when they look at the menu..... don't worry mom/dad it's all covered.. order what you want!
The DXDP we've tried when switching resorts. so we spread those credits out over 2 days. We've only done that twice. If DH and I were to go alone, with no kids we would probably do that plan the whole trip and eat at some of the more upscale restaurants every day

but I don't see that happening
As far as saving $$... we've saved money on each trip with what we ordered. But.. there are those that will say... did you really save money?? Would you have purchased everything if you weren't on the plan??
I would say no to that... I would have told my kids, sorry you already had a snack today, you can't get another. You can't have your own bag of popcorn, you must share with your sibling.... But with the DDP I don't have to! It makes our vacations more of a vacation for me and them.
Of course I did like it better when the tip was included in the price...........