I got upgraded one time at the YC. Had a standard room and asked for a lagoon view and got it. I think it depends on season, and who is behind the desk. That was over the 4th of July. Last time I asked at the Poly in August and she said, no, we are full. So, you take what you get and hope you are not disappointed. But I have to say, after it works once, you are still sort of disappointed the next time when it doesn't work.
Carol