You mean XX?

I've used SRAM Red and it worked fine. There are some differences from DA in how the Front der. trims and generally I like how DA does it better. Other than that either group is good. I personally stay away from Campy because I travel with my bike and it is easier to find a Shimano/Sram compatible part out in the sticks than a Campy part. I have DA on all three of my road bikes. I made the decision several years ago that I use my bikes enough to justify the added expense over Ultegra or Force. DA is just a bit smoother and lighter than Ultegra and it makes for a more pleasurable ride.