I am on this same cruise (ship/itinerary) 6 weeks before you. My Cruise Planner says that the UDP is $239 per person.
Grandeur has three specialty restaurants: Chops, Giovanni's Table and Izumi. (no hibachi experience). That means an average of four dinners at each one, and some lunches, if you want to "get your money's worth".
"Savor the savings with the Unlimited Dining Package! For one low price, you can enjoy multiple entrees and visit multiple specialty restaurants every night of your sailing. And as an added perk, this unlimited package also applies to lunch at specialty restaurants on sea days. Plus, enjoy a discount of 40% off bottles of wine under $100 and 20% off bottles above $100 while dining in specialty restaurants.
A courtesy reservation will be made for the first night of your cruise based on your preferred dining time. You will receive your courtesy reservation confirmation in your stateroom on the first day of your cruise. All additional reservations or changes to your courtesy reservation must be made once onboard at any specialty restaurant.
For restaurants with a la carte pricing, you’ll receive a $35 food credit.*"