Some other important comments since my last stay (Dallas, Park West):

When you get a Hotwire rate it shows directly on the reservation. In this case, I didn't get most of my preferred options (although the key one of 2 double beds was one I got).

Hotwire rates do not count towards stays OR miles, even for Gold Members.

(It's generally easier just to use a 50% off certificate and/or an upgrade certificate.)