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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.
What made you choose them? over TRP. Need to look into how each works.