We just did this in early August.
You choose from the regular dinner menu. You'll get your choice of appetizer, entree, dessert, and non-alcoholic drink. I liked it a lot; DH liked it but not as much as I did. My kids were happy. The atmosphere is great, and our service was excellent.
We've also done the package at Mama Melrose which was good too (though only one credit).
Whether it's "worth it" or not is subjective. If I were on the deluxe plan and had plenty of credits, I'd certainly do it. In terms of cost, HBD is one of the less expensive two credit places, so it's not necessarily a great value, but we liked our meal just the same.