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FWIW I am running Racingbrake XT910s on all four corners of my 'iS and they are a tad noisy on the street but have great feel. Will be tracking them for the first time in less than a month so can't comment directly there, but I have run their lower-spec ET800 on the track with good performance but with thermal issues (smearing at the ends of the stints). I expect the XT910s with their higher-temp range to perform better as a so-called hybrid pad.
I run slotted rotors, ECS SS lines, and Motul RBF600 fluid.
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