It's interesting, I've never used deltastays before, so I didn't know how it would work. They took my Hilton number and thanked me for being diamond, gave me a treat and told me to park in a diamond space. I had booked a suite already, so not sure if I could have gotten a room upgrade. The stay is listed on my Hilton account, but obviously no points and (unfortunately) no nights. But, I got a bunch of MQDs, so mission accomplished. (Actually, it was a fantastic family trip and that was the true mission!)