Originally Posted by R1lee

No no it's the same, take a look at the pic. My lbs had both bikes in stock, there was zero difference.
TCX Advanced 1 (2014) (2013) | Giant Bicycles | United States

the cost of the r785 shifters were something like $500 Canadian. My lbs doesn't charge me for any service.
i had the 6770 rd and fd already, but I had chain suck issues. So I've decided to go single chainring and a 6870 rd to finally use the 11 spd.

di2 is slightly a little heavier if you use the external battery. It's because the external bat is twice as heavy as the internal and the battery mount is pretty heavy. If you go internal di2 is lighter then it's mechanical equivalent.

yeah once you try electronic, I doubt you'll very want to go back.