Sorry, I guess it's not good at Emeril's. Here's a copy of info. from the Mousesavers website:
"AAA/CAA Discounts - Members save 10% at select dining and merchandise locations in the two Universal theme parks (savings not available at food or merchandise carts and does not apply to tobacco, candy, film, collectibles and sundry items). Members also save 10% at CityWalk (discount on food, non-alcoholic drinks and merchandise at all Universal Studios CityWalk Orlando restaurants with the exception of Emeril's Restaurant). Applies to member and immediate family (up to 6 people). Show your membership card to get the discount."
Note: I'm not sure about that part about the food & merchandise carts and not applying to film, collectibles, etc. I got the discount when I bought film at the RP gift shop, and we certainly used it at every souvenir place. The only time we were told we couldn't use it was on a video in one of the gift shops at Islands of Adventure.