I just got my system 6 back from spydercomposites and it freaking rocks. I broke the carbon frame last month on the downtube and was going to trash the frame, I meet a guy at on a coffee ride who just installed new Di2 with internal cable routing that was done at Spyder composites. I bought a Di2 group about a month ago but didn't want to install the group until I bought a new frame, after talking to Spyder about fixing the downtube they agreed to install my Di2 group with the battery pack in the downtube and internal wire routing throughout the frame when the repair was being fixed. I can't tell how much I'm pleased with the carbon bike repair and Di2 install, not only does the frame look and ride like new but the Di2 is the best investment to date, and this comes form a die-hard campy guy fo-life! Anyway, the bike rides like new and I feel like I got a better bike for less then a new bike without Di2.
I highly recommend Spyder Composites for any carbon bike repair or Di2 install. They also delivered the frame to my local shop.
BTW-OC next time you need a carbon frame fixed use your local guys, Spyder does work for In-cycle (I beleive thats your team??)