I have not noted any significance in brake dust on my M-SportD with the 469's. This is coming from my last BMW being a 2011 M-Sport 3-Series. To me the pads are about the same if not a little better from a dust perspective. The 2011 3's pads were a huge improvement over my 2003 M3.
Personally, I think BMW is making the pad compounds harder so they last longer and the low dust is a side benefit.
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Regards,
Clifton
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