I have Chorus 2x12 on my David Kirk and I could not be more pleased! Chrous chain does not come with a master link, though Record and SR do, as I understand it, but let your bike shop install one for you.
Before I got the Kirk, I rode a Ribble ti bike with Shimano 105 Di2. Liked the electric shift and disk brakes well enough but Chorus is a much more pleasing experience. Good luck with your quest!
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