In general, upgrades appear to be available through the luck of the draw, but this is one property where it may help to call/e-mail in advance and at least make the request.
I'm sorry to hear about the indifference by your check-in agent. The people I spoke with were very friendly, professional and informed. They offered all the little things that are nice, like a proactive offer of the platinum amenity and suggestions for local restaurants (i.e., not the one in the hotel).
[This message has been edited by Pietro (edited 05-27-2003).]