My husband and I are staying at the Hilton Waikoloa in October using points. He is Diamond with them, so he gets complimentary room upgrades when available. However, when we booked the room, there was a warning across the top of the page that stated that upgrades are limited, so please book the room that you expect to get. Just wondering if anyone has had success getting upgraded here. Not that it's a huge deal, and I know it's never a sure thing, but I just want to know if we have a shot.