T-Rex is OOP. The food isn't that great for the price you have to pay. Last April it was $60 for 1 kids plate, 1 entree, and 1 appetizer.
May I suggest using a QS voucher at DTD and then hit up T-Rex for a dessert to share? That way you can control your OOP expense and still get the experience of the restaurant.
We were planning to pick up food at Earl of Sandwich then dessert at T-Rex, but we switched our dinner plans to Boma. Since DH and DS liked T-Rex so much (the atmosphere, not the food...) we will most likely return for dessert once dinner is over.