To make a broad, general, statement, I usually find Marriott reservations and MR agents to be more knowledgeable, courteous, and professional than what I get from any of my other travel vendors. As with any organization, you can always find a "bad apple" here and there....but I'd say 95% of my experiences on the Marriott 800# are positive. Most of the agents IME go out of their way to be helpful and sensitive to my wants and needs.