I'll give my report on the DDE experience. I was only able to get thru and purchase the card while at the airport waiting for my flight to Orlando. The people at DDE were great, and faxed a confirmation to Allstars where I was staying. I was asked for ID maybe 3 times. On my last day at AllStars, the CM in the food court refused to accept my confirmation. I asked her to check with someone else, as I had used it there for five days. She got out of her seat, walked around to the next cashier, rolling her eyes, and making clicking noises with her tongue (like tsk-tsk) Of course the other CM said use it. After she rang me up, she started quizzing me--why are you doing this, you only saved a few pennies; why don't you have a card, are you doing something wrong?? I was really upset; I spoke to the manager who said she was sorry for the behavior.
I also had trouble using my confirmation at Restaurantasaurus--after a very lengthy delay, a second manager stepped over and bought our meal for us (I didn't know what was going on until they handed me a paid receipt).
I had to remind most staff, but towards the end of the week, we were getting the discount as explained.