Actually, these "promos" have been offered at Starwood hotels chainwide (subject to availability, of course) for several years, and have been mentioned literally dozens upon dozens of times in this forum. There are versions for two, three, four, five, and six nights, sometimes supposedly requiring the use of a particular credit card, but generally not.
Note that these are
prepaid and
nonrefundable. Also, there are restrictions on arrival day of week, capacity controls, etc. Sometimes the payment is charged immediately upon reservation, other times not until day of arrival; seems to depend on the hotel.
Some excellent deals can be found; I and lots of other FTers have certainly saved bundles of money over the years. (The discounts are off the BAR -- the so-called Best Available Rate -- which is less than the Rack rate.)
Here is the Starwood-worldwide link for hotels:
http://www.starwoodhotels.com/promot...M=SPG_SO_DRE_H
And the Starwood-worldwide link for resorts:
http://www.starwoodhotels.com/promot...egory=GENDRE_R
(Both these webpages have links to each other as well, in the upper right.)