I put Di2 on two bikes and attention to detail is super important. As far as I know, no bike shop is going to spend as much time as I did taping, wrapping in foam, and heat-shrinking parts. A Di2 install is perma, while cables are not, so approach the installation with that in mind. Also, I decided to put the internal junction box in the downtube on my CAAD12, in a chain-stay on my Stigmata, so make those considerations as well.
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