I live in NJ which gets a considerable amount of snow in the winter. However, it is a crap shoot. This year, we didn't see any snow. The year before, we got tremendous amounts. Anyway, it is so new that no one will probably have any feedback until winter comes along. I have two other cars that I can use in the snow so it wasn't really a consideration when I bought the M6. I have driven it in the rain and saw no problems with traction at all in low and high speed driving. Maybe get a fwd or awd second car that you can use in bad weather?
'16 BMW M4 Alpine White
'17 BMW X6M Melbourne Red
'15 Lexus IS250 F-Sport Atomic Silver