The answer is long, tedious, drawn out, and very subjective. In trying to keep my answers less than novels (I've already failed at that once today), I'm going to give you the quick version!
The "Short" Version
Basically, if you're going to follow the below guidelines, it
might be worth it from a savings perspective:
- You already plan to eat the way the plan is structured
- This includes the 1TS, 1QS, 1 Snack per night and...
- An entree, dessert, and drink at every meal (except breakfast, where you don't get a dessert)
- You aren't going to be sharing/splitting meals (now, some sharing/splitting in order to extend credits is ok, but just in general, you know)
- You're looking at TS dinners and QS lunches (breakfasts, outside of a very few cases, are generally not going to save you money)
- You tend to order from the higher end of the menu
- You're more interested in the higher end of the single credit restaurant list
- You're not very interested in any 2 credit experiences
If your trip fits all of those, then there's a good chance it will save you money.
The Long Version
This link takes you to a post on a thread I made just today, while it may be geared to a specific posted, it's actually a pretty decent generalized post that goes into the various considerations and methods to determine if it's really worth it.
You also will want to weigh the subjective cost of the prepaid nature and the having to stick to the structure itself when looking at any savings or loss. For example, due to me being horrible at saving money, even if the overall plan was "losing" me $50 or less (or maybe even up to $75-$100, depending on how I feel that day), it would be worthwhile. This is because I assign a rough value to the prepaid nature to help me with my budgeting issues. Others, may not get the plan if the savings is less than 10-15%, as they feel the structure of the plan inhibits their desire for flexibility and such. Neither of us is wrong, as it's an extremely personal decision.