RS4 is a favourite of the low dollar (no such thing really) endurance race crowd as it has pretty reasonable grip as a track tire, and wears very well. Pretty decent in the rain, not as good as some of the other 200 TW tires but when I raced on them I thought they were good. We'd get 8+ hours out of them on track in the dry. For street driving they'll be a bit harsh compared to other non-track focused tires for ride, noise etc. but not intolerable from what I'm told ... I've not experienced them on the street myself, only on track.