All year as a diamond this year, I have received "zip" special consideration.
Zip. Nada. Nuttin, honey.
Don't even think I'd know the difference, if I weren't a card carrier at all. In fact, perhaps I'd be treated better if I didn't have one at all?
I'm not going to be working on getting Diamond this year, unless I'm offered some kind of fast track that makes it easy.
It's just not been worth it, to me, in my experience. Gold is fine, thank you.