I'd thought the M6 wheels would look stunning on the M3 (they looked pretty beastly on 335s, and even E46s). Looking back, I don't think they compare to the stock 19s, and certainly not to some of the 360forged and HRE wheels some of the guys have.
Secondly, my CA gave me a nice little shpeel about why
he thinks the idea of putting the M6 wheels on the M3 should never even be considered. Basically, he went in to how the M3 wheels are engineered for the M3, M6 for the M6, etc, etc, weight, blaaaah. Yes, all things to consider, but in the end I don't think it would make much of a difference. He also hinted that BMW would probably be releasing some aftermarket alternatives to the 19" wheels, specifically designed for use on the M3 - fact or fiction, I obviously don't have a clue.
Those black Breytons are hawt too!