I was given a room in the RBC at my last 2 stays. For what I have seen the rooms are the same size and look the same that the other rooms in the hotel. RBC rooms are on the top floor providing a better view and the lounge is 3-4 floor down.
The hotel architecture is quite stunning but the rooms are nice but nothing to talk about exept for the nice glass shower in the bathroom. Balcony is very small. Yes it is probably overpriced but the resort is quiet and secluded...
The RBC difference is the access to the lounge providing cold and hot breakfast in the morning and apetizers and free drinks in the evening.