I replaced the 105/tiagra mix on my 2013 Madone 3.1 a year ago and killed my motivation for a 5k new bike. Got the parts on eBay new for around 1k, latest 11 spd 8050 with buttons on hoods. Junction box in bar end and the taped wires under downtube / rear stay using the special Shimano adhesive strips have held up well and very discreet. Next bike someday will also be di2 - works perfectly all the time, made dismantling and safely protecting RD for shipping bike to France a piece of cake, no frayed hood cables every 3-5k miles…
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