I hope you mean Fantasmic not fantastic.
In my point of view, the dining package isn't really worth it, the seating is no better than what you get if you just get in line and go sit down, and if you go on a day when there are two showings, the 2nd one usually has a much smaller crowd, you can often get a good seat showing up perhaps only 20 - 30 minutes prior to the opening of the theater.