Has anyone tried to get the Marriott and Sofitel benefits:

Marriott: $100 per night in resort credits toward spa, dining, golf and resort shops with a min. 2 night stay.

Sofitel: Purchase the first night and get the second night free plus a complimentary breakfast at 11 exclusive Sofitel hotels in the U.S. and Canada.

These seem like very nice deals if they apply to discounted rates, esp. since they don't seem to restrict the number of times you can use the offer.