I have the Brembo RCS brake and clutch master cylinders on my 1199.
Initially, I installed the RCS brake because I wanted my 1199 brakes (spongy; because of abs?) to feel more like the ones on my previous 1198 (grabby.. i.e. one finger braking).
Happy to report that they met my expectation in the brake "feel" department.
If you're after a change in brake feel, I recommend the RCS.
Curious if you got the matching RCS 17 or the 20
If 17, The piston is the same, Did it change the feel at the 18 or only the 20 cam position?