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@Greenbank
Lots of hair-shirt Audaxers still rooted in the 1970's said that people using Di2 on Audaxes would suffer plagues of problems. Plenty have done long rides with it with no problems at all but, as you say, a failure could mean HTFU-ing with singlespeed for a while.
The PBP controls did have mechanics (who could replace broken gear cables, retrue wheels, etc) but not sure about the availability of Di2 spares, even in 2015. You'd only be 12 hours max away from a bike shop though, and you'd hopefully find one with Di2 spares.