on when i'm bimbling around as i can't be ***** turning it off.
Off when i'm not bimbling, or often in the wet. I find the car much more predictable with it off. If you overcook it, the slide, oversteer etc is much smoother than when its on. Typical example, gone a bit hot into a corner, lifted ( I know I shouldn't) car starts to oversteer. With ESP off simple case of feather throttle and smoothly out. With it on, ****** thing wibbles and wobbled round the corner. Both end up in same result but the first seems much niucer to me and the car.
Morale: don't overcook corners!