They are terrific about applying any code that you are entitled to. I have gotten my room only rates changed several times in the past. I love DU and recommend them to everyone I meet! Yes, I love the 'thrill of the chase' thing and being able to control my own plans. But there are times that I just can't be sitting by the phone, on hold, in order to get that great AP rate. So, my agent at DU gets it for me. Needless to say, most of us use the same agents over and over.