I love my 545 6 speed. I am going to miss it. One thing about it (and every other 5 series I've known) is that the wheels get covered in brake dust pretty much within seconds after being cleaned. Over the years, I've given up on them really. Now that we have months of experience with the S, I'm wondering how brake dust works with it. Not much? A lot? Would be a lot, but regen braking minimizes it? Too snowy to know?