I've been a hard core Dura Ace fan for the last decade, but the team rides SRAM, so I"ve started riding some RED components. I also used Force for CX this year and was happy.
So far, I'm swapped out the shifters and rear derailer. The force shifters have a LOT of feedback to the rider. This includes snapping, popping, and a firm shifter feel (note: some people like this, I do not). The RED shifters seem to have shorter throw, and I find them much quieter and more agreeable on the hands and ears.
The shifters are still not as nice as Dura Ace, but they are cheaper and lighter. I am not sure of the durability.
It may depend on your personal preference, but if you're a racer on a budget, RED is a good choice. If your budget is a little higher, and you don't mind a tad more weight, Dura Ace is for you. If you are a dentist riding a Serotta, Campy is right up your alley (Ha!, but it sure is pricey).