I'd say it depends on what type of upgrade you're looking for. If you are just wanting to go from a no view room to a resort view room, I'd say your chances are good. I always book no view rooms and I've always gotten rooms with what I consider to be good views. If you're wanting an upgrade to a balcony or a suite, that's probably not going to happen. Having said that, I did get upgraded from a no view room to a 1 bedroom suite last year, but it was only a 1 night stay and I let them know that it was my birthday. Also am Platinum now, but other than that 1 time, I haven't noticed any difference in the room type or view as when I was Gold Elite.