I use my Chase MasterCard Debit card when for this promo. But I do 'twist' it a bit as my company requires us to use their Corporate Visa card for all business travel. So I'll reserve a room using one of Hyatt's prepaid rates with my Visa, then when checking in I'll give them my debit M/C for incidentials. I end up keeping my company happy (lower rate), as well as getting the FFN stay.