Shea - you sure you want to give up that Cannondale? I've thought Di2 would be totally fun but couldn't justify it. Riding a Domane 4.3 carbon as the roadie.
It is dangerous here in coastal north San Diego, tourist rubber necking and making sudden turns, locals getting in a huff and pulling sketchy moves, drivers literally bullying bikes in sharrow lanes, I have a close call every 3rd ride or so, meaning I've been pushed to the curb, run out of the sharrow lane by horn blowing engine revving crack heads - it is so bad a percentage of us run GoPros front and back in case we are hit & run, or get into litigation. I'm over it. With my e-bike I can stop faster and even accelerate away from some traffic situations, weight and stability come into the safety equation as well. Daylight flashers front and back everytime.
Di2 rocks! No cable to stretch, great battery life, never misses a shift. I hope to have an electronic 10 speed XTR or whatever on an e-bike one day, maybe with options to turn over shifting to an advanced open source controller, program gear correlations, set precedents for heart rate reduction, etc.
BTW - For my next graphic I would like to look at just where is the weight in my 2014 Dash, color code motor, wheelset, tires, battery, frame, forks, cranks, etc. See how much I can trim and where. I'm already thinking 38c tires as a first step, and 'if' that Suntour fork is heavy and slow, low end, maybe a non-suspension fork. I'm already taking a 'loose grip' in the bumps on that thing, putting my weight over the BodyFloat, to well, float thought it.
For me keeping the Dash almost certainly means a second battery and rear rack to hold it, essentially 17.4 amp hours, 60 - 70 mile range, enough to ride to the San Diego velodrome to watch and photograph the races, visit friends and places currently out of range. The Cannondale should easily fund that and more, perhaps a
Kilo fork!
BTW - Before the Super 6 I had a Madone 6.2, a 6K demo bike for 36 hundred, under 15 lbs before pedals etc. I got some very scary speed wobbles on that thing at 37 mph, and so traded for the Cannondale. Was diggin the power transfer of that bike, super wide BB.
-Shea