Actually with doing some more thinking, I would guess this question would apply to all the different Princess ships. As far as whether the dining areas that have "sur-charges' are woth the extra expense, and what the benefits are of these rooms.
most of the pay for venues have very long drawn out meals several courses taking about 2 1/2 hours and they have extra top notch presentation and service. it is just that extra ooomph as it were.
Personally I am quite happy with the food and service in the dining room.
We ate at Sabatini's and Bayou Café on our Panama Canal cruise. We were under the impression that we should make reservations immediately and we did. Both restaurants were very sparsely populated on both nights. That being said, Sabatini's was the more expensive and the best meal. The service was great and the meal did go on for hours. It was very well paced and the serving sizes were perfect. We were full when we left but not over-fed. Bayou Café was not as good. The food was well prepared but you have to be real cajun enthusiasts, which we are not. The music was overpowering and even though we sat as far away from the bandstand as possible, it was very difficult to hear the wait staff. If I were to do it again; I would definitely eat at Sabatini's.