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amey
miro_o
This isnt really Worth asking. But incase I'm missing something.......
I'm buying a gearset. Ultegra 6870 Di2 is around £650, Dura ace 9070 Di2 is around £1250. I think the weight difference is 149g (for the gearset, not groupset), the functionality identical, the compatibility identical, and the ergonomics identical.
So for £600 you get a more aspirational logo on the Components, and save £149. Not exactly a bargin.