I am considering purchasing a Dinner for 2 certificate for my upcoming trip to Phoenix, and plan to use it at one of the JW Marriott restaurants. In other posts, several people have mentioned having difficulty using these in some Marriott locations, including Phuket. Has anyone used them recently at the Phoenix JW (Tuscany or Steak House)? I have previously used them successfully at several resorts and Marriott hotels, including excellent dinners at Dana Point and Newport Beach. I only had a problem at the Marriott World Center locations. Please share your experiences.