I've used the Redstuffs for years on my e90 at the track. They are hard on the rotors and do require high pedal pressure but they have never failed me at the track (make sure that you use high temp fluid - I use Motul RBF600). I eventually traded out for Performance Friction Z rated but the PF pads are not available for the 135is.
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'07 Z4MR '22 GT4 '18 GT3 '16 GT4, '16 M2, '14 X1, '13 135is, '06 330i, '03 323 Ci, '01 330i, '99 M3 (RIP), '96 318is, some non-BMWs
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