I am in a unique position in having the difficult task of choosing between the three*... Di2 is awesome when it works, but if it doesn't, you're stuffed. Perfect shifts day in, day out. It does also have a weight disadvantage. Practically maintenance free apart from charging the battery and lubing the chain. Force22 is light in comparison but settling in will occur and adjustment will be required. Cables and housings will need to be changed every so often. Edit: Athena EPS has emerged as an option now too. Middle ground between the two groupo's and is Electronic... And more importantly, it's Campy.
