Yes you have to be a Florida Resident or AP holder. I don't know the phone # but, I'm sure someone else has it handy!
We chose to go with the DDE since we purchased APs this year. We recooped the cost of the DDE card ($50) within the first 5 days of using it. Since then we have been an additional 9 days and I'm sure that we also recooped the extra that we spent on the APs! I haven't kept up with everything that we have saved but, I know it is a bunch!
When we eat in a sit down restuarant, I always tip based off the original amount (usually 20%). And the new total with tax and Tip is always less than the original total with out tip!!! You can't beat that!
I've never done the DP so I can't really comment on it or support that it is any better or worse than DDE.
Good Luck with whatever you decide to do!