I have Di2 paired with a Garmin 1000 which shows me the gears on the screen - never have to look down to see what gear I am in.

A 10 speed holdout!

Look up "long" battery mount. That goes under your cage.

If your rd dies and you haven't updated firmware, you can swap in 11s rd, chain, cassette and crank.

What if I told you I had a NIB 6770 backup...

I found a flow chart showcasing some new junction box is all I might need to get an internal battery integrated.

Where do you live?

There is no question.

Just because others feel that way doesn't mean you have to as well....build it however you want.

I have one bike with Di2, one with mech DA and 4 bikes with mech campy. Di2 is good, but I don't need it on every bike. you should get it and decide for yourself.

Yeah, if I had more than one bike it would definitely be a no-brainer. Unfortunately, I'm an n=1 guy.

And, do I really need it? No. Like I said, my current mechanical set up shifts flawlessly. But, I do ride my bike just about every single day (I don't even have a car, nor do I want one), so I think I just want my ride to be the best that I can make it.

Ok, so who's got an excellent condition DA 9000 Di2 upgrade kit they're looking to get rid of cheap!!!!! :)

If running a sub optimal chainline is the major issue, surely you can hear the chain contacting the FD when in big/big and feel the drive chain slack when in small/small?

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Yes. As long as its this DI2.

http://www.disraeligears.co.uk/Site/...leur_C810.html

Tried Di2 on a bike that I eventually sold. It's nice, but mechanical works just as well. It's one of those things IMO that you don't notice. If you're going to experiment on making your N=1 as best as it can be, I'd try something like carbon tubulars.

Sprint shifters. And don't compare them to Campy thumb tabs, it's not the same. :)

When just last week the cable end snapped off in my 11 speed rear shifter and I had to watch youtube videos on how to rout the cable through the frame using magnets and trying to salvage the bar tape at the same time I cursed and cursed and cursed cables and swore I was going to DI2 in heartbeat #@$*&!!

Then I got it fixed and now I'm back too... Meh... it works.

I just built up a new bike with DA 9100 mechanical after using Di2 exclusively for three years. IMO Di2 is a "nice to have," not a "have to have."

With Di2 you gain:
Precise shifts, every single time
No cable stretch to worry about
The ability to fine tune shifting on the fly via the junction box and shift paddles
Rapid-fire downshifts and upshifts. You can dump an entire cassette very quickly just by holding the button down.
Clean lines without shifting cables running down your downtube

Potential downsides:
You lose a lot of the tactile feel that many of us enjoy
If you're a traditionalist, you obviously lose that aesthetic when going electronic
Your wallet gets lighter
Definitely not a major pain point since it is so infrequent, but you do have to remember to charge the battery

If it's in your budget, I say definitely go for it. But like I said above, IMO it's a "nice to have" and not a "have to have."

The ability to change configurations with the electronic shifting is a big plus for me. I spend about two months with aero extensions on my road bike for an ultra event and with buttons attached to those bars and 5 port junction, I'm able to shift in the extensions without having anything permanently mounted for the other 10 months I'm riding that bike. Being able to shift (rear only) while staying down has been a big help. I wish I'd done it sooner.

Also, in extreme cold, shifts in Di2 are easier - you can do it in lobster mitts or whatever you use.