Actually, I just spent a week with a Gillette HD Rocket. A trip down memory lane, and she still provides an excellent shave.
I find it necessary to use a DE for a final pass on my neck. My beard grows horziontal east to west. I've tried about every angle I can with a straight, but only the DE, because of the much shorter length of the head, will work XTG on my neck. 150 years ago I would have been one of those neck beard guys.