Are you going for a compact, semi or standard chainset?
The non-standrd chainsets are usually later.
What's the benefit of a Dura Ace integrated over a DA9000/9100 chain set with a Pioneer power meter?
I have no idea.
I do have a Pioneer though and most of the two-leg features are only available if you have the Pioneer head-unit, which is shit, and massive.
I've only got one side so it's by the by for me.
@Bainbridge started
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Are you going for a compact, semi or standard chainset?
The non-standrd chainsets are usually later.