I agree with the post above. Diamond doesn't do much for you at a Hampton. I've been diamond for quite a while and don't really notice too much when at the Hampton. Although I do normally use the Hampton's to GET my diamond...
Now when you stay at a large Hilton you'll really notice the difference. We just got back from the Hilton Arc de Triumph in Paris about 3 weeks ago. Even the little things like free bottles of water, access to the lounge, free drinks really start to add up.
Have fun!