I'm not a fan of the actuation used by SRAM double-tap technology. And I base that opinion not on personal use -- in fact, I've never used it -- but rather on the experience of having ridden in pacelines behind a lot of other cyclists who do use SRAM. I don't know what's going through SRAM-user's heads while they're shifting, but what I see & hear is an awful lot of wasted time & wasted effort. Shifting gears on a bike shouldn't be that hard or take that long.

But I didn't vote for DA9000 because every report I've read of Ultegra 6800 suggests that it is such a perfect sweetspot of cost versus performance that it's the preferred Shimano solution to practically every "What Groupset Should I Choose?" question. I've got 6700 on one of my bikes now, and if 6800 is even the slightest bit better than that it's an amazing gruppo.