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@Dammit
Just under 50 miles on Dura Ace Di2 today.
I'm not used to it yet- braking for some of the turns at Richmond Park I shifted up instead of down a couple of times, oddly always at the same corner for some reason.
However, Di2 is so fast that you just hit the right button a couple of times and you are in the correct gear.
It's quiet, too- compared to my Apex it's totally silent. To the degree that I found myself looking down at the cassette to make sure it had shifted- after a while I stopped this as I got to trust it.
The front shifting is cracking- and the auto-trimming feature is outstanding. And it makes a splendid "kzert!" noise.
I had my doubts about the brakes, but they work fine- I adjusted the EE Calipers as outlined in their manual, braking was powerful and nicely modulated.
Overall, it really is very good.