Yesterday we were at the flagship store of one of the larger bike shops in the nation where they were changing the BB bearing on our Burley. I made an appointment, drove two hours to get there, and was in and out in an hour. Great service.
We also went through a set of measurements for a new tandem, which I figure is not too far in the future.
The bike shop folks told me they have, so far, refitted two CoMotions with Dura Ace Di2 setups, 50/34 cranks, and 11-36 ten speed MTB cassettes with the Di2 rear derailleur. I was told it can be set up to shift flawlessly.
This is really of interest to me. Has anyone tried it or have any first hand knowledge?