Hey thanks everyone for the pictures, I really appreciate this!
I think the 464M's look very nice on a dark color although the bi-color effect doesn't look very pronounced.
Actually, to be honest, I think they look totally different from the picture in the online bmw accessory finder. There, they seem to have black insides which look even better and sportier.
I tried that picture in a photoshop-edit and loved it, but on photo, they look more as a solid ferric grey, in my humble opinion. Nevertheless, they are 30% off...
My preference however still goes out to the 373M.
And as remmib says, on that silver F30 these look just amazing.
ah... the (luxury) choices we have to make... haha