Shane - I put the RS5's on the back of the 530i (on 17's) last winter and have found them very good. They're fairly quiet, great in the wet, no complaints in the dry and most importantly they overcame my only criticism of the RS3's in terms of being a little soft on the sidewall. That improvement didn't come at the expense of comfort, still very good on that score. Not the usual amount of mileage on them so far because of the effects of restrictions over the course of the year but still a decent few thousand.

If you're still happy with the RS3's overall by the end then I think you'll find the 5's are more of the same +.