For me, I feel more comfortable in Sport mode, both in turn and at high speeds on long bends or stretches of road. I'm not saying that i am faster, but I do feel more planted and stable in the overall body movement of the vehicle....less sway.
I have 3 track days coming up this week, and have had considerable more knowledge of the car now; since my last track event back in May. I'll post my feedback from the events.
2008 E92M3-Space Gray
Eisenmann Sport Exhaust_MT/Loaded