yes, 15% discount for me, too, with AAA card. And it's been that way for a couple of years. Not sure if they've changed it recently, but about 3 weeks ago I asked which gave the best discount and was told AAA. (At DLR)
The timeframe for the Bday sandwich was long enough that I received it, took it to WDW for 2 weeks and forgot to use it, brought it back home and visited DLR to get my free sandwich!!!