I felt this on the track once or twice. Didn't kill my turn entry speed and actually kept it about right as I had waited too late to brake. The car just did a little extra... where I would have let up sooner and possibly risked to hot of an entry into the turn.

I'll leave my ESP and BAS functional for a while longer while I learn better cornering techniques. When the traction control light or BAS no longer assists me, then I'll be comfortable with turning off the traction control when I'm at the track.

Until then, I'll let the systems save my sorry A$$ from time to time.