Just to clarify, my original reservations were for six nights at $239 made several months prior to arrival. After checking travelocity a few weeks prior, I saw that they had a rate for the exact room type at a $179 rate for Thurs/Fri/Sat. I called the reservation line and after some discussion, they matched the Friday and Saturday rate based on the new Long Weekend promo (I think that was what it was called). However, when I stated the rate for Thursday from travelocity, I was told that I should cancel my reservation for that night and book it through them. The spg reservation person said he could not offer me that rate.
Following that, I forwarded the information to "guarantee" fax line and received an email that I did not meet the 72 hour after booking guarantee. Personally, I thought it rather user unfriendly since I could have cancelled my whole reservation and started over to meet the 72 hour requirement, but since it was so close to my leaving for the first leg of my vacation I didn't want to risk having the whole thing become a problem.
One final note, the SPG magazine in the hotel room noted the special week-end rate and stated it included "buffet breakfast daily" at the "W" Mexico City. When I inquired at the front desk they knew nothing about it.
Since I was in the "W" groove, I just let it go and had some great mexican breakfasts out in Polanco.
My stay in Mexico and the W was so great that I haven't thought twice about the rate since I returned.