Not saying that DA is the best, but it appears to be considered the best that Shimano offers. With my putzing with triple-chainrings to choose from, I have to ask: How come there is only one choice for a triple chainring: FC-7803?
It would appear that the 50-39-30 triple would be the cat's meow for me, when paired with a 12-27 10-speed, because the resulting gear inches would be pretty useful for my type of riding.
So, why just one triple-ring choice for the DA ... and how do we lobby Congress for the addition of the 50-39-30T to the DA group? How does Shimano decide what John Q. Public wants, before Shimano incorporates new components into their different groups?