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r_mash-
I've had a R1 on a disc front/fixed rear build for a few years so just have a good experience. They were cheaper and much lighter at the time.
They are also smaller, don't think I'd have got the TRP onto her bike, only a few mm clearance on the back.
Think they are originally race brakes for CX, have a smaller chamber Vs TRP so not suited to long Alpine descents. Super easy to adjust on the fly.
spinnnout
Got the R1s from eBay via Ireland for £125, you can get them direct for less but risk import taxes.