• The good thing is that I have already chorus 12 calipers so it will fit perfectly. I was pondering if £200 are worth the new/used thing

  • I dont think there's any difference between chorus 12 and chorus 11 rim calipers, as in they are exactly the same. Record and Sr have a different shape to them, otherwise there's no difference to any of the rim calipers anyway.
    12 speed cassettes are very expensive which is what stopped me. They're £150.

  • For that price difference I don't think there is any point buying it used, given that the chain is not original it's more likely that the cassette/chainrings are already well into their usable life.

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