Originally Posted by
jmechy
It seems that the buttons on Di2 can be clicked so fast that multiple throwing on DA-7900 would be slower than just double (or triple, which apparently 7900 can't do) clicking the Di2 levers.
Di2 rear shifting isn't exactly fast... at least not on the Specialized Tarmac I test-rode. Probably about the same speed as 7900, if not slower. Certainly no match for Red...