People are always looking for good brake discs as cheap as possible. I had heard mostly good reviews about them but a few bad ones, I took a punt and bought a set of dimpled and grooved for my R32 brake setup and drove 5000miles+ with no problems. I never went on the track but they saw some very hard road use and never let me down. Now I have a set of MTEC Drilled and grooved TTS discs with my 4pot TTRS setup, I have put about 2000miles on them now and again they have done very well and seen some very hard stops (with some quite aggressive pads as well). They are a bit noisy but that's because of the pattern on the discs and the aggressive pads.