I rarely if ever used the Ambassador's and see it as nothing more then a better phone line and more experienced agents. I called the ambassador line trying to make some reservations for dinner and some activities since the hotel is short staffed with no concierge. The ambassador was going to call the hotel, so a complete waste of time.
FYI I am staying at the La Posada in Santa Fe any recent experiences, since I am now looking at the residence inn for a third of the price. Room and location are not as nice, but service will be the same.