I'm just within a few AM's of getting a $25 certificate for Marriott Hotels. I want to use the certificate at Courtyard DTD. The way Milesource describes it, I can't determine if these certificates are good only at full-service Marriotts, or Courtyards as well. I've tried emailing Milesource customer service, but they ask for a membership number (???). I never had a membership number. Well, I guess the only thing to do is see if they will take the certificate, but don't count on it. So, has anyone actually used one of these certificates at Courtyard DTD?