My final stay as a HH Diamond, as I've dropped back to Gold since then.
Hilton Dallas Lincoln Center
Booked standard king room
Received (without asking) 2BR/2.5BA presidential suite
Although only one night (and I arrived pretty late), turned out to be the perfect upgrade as my team was preparing for a presentation the following morning, and we were able to do that in my dining room instead of the lobby or exec lounge.
This was actually one of the nicer super-suites I've seen or stayed in. Really way too big of a room for fewer than four people - I tried to be nice to housekeeping and didn't even use the other bedroom or half bath aside from taking a few photos. Only complaint was the HVAC was a little wonky, probably due to there being four thermostats through the place.