Personally I like the safety element of it, I feel it suits the M6, given it is a GT car as apposed to a lighter, small sports car. British roads can be bumpy, narrow and not terribly straight so minimal amount of driver aids can help.
Also if the suspension is set to hard, there is sometimes a feeling of potential disaster, I.e being thrown about and off of some 'B' roads over here so I tend to drive with the default softer setting yet crank up the BHP.
All above means that S6 is rarely used on my car.......bring on the angry mob!!
I love it and also hate it. It gives good confidence when road conditions are sketchy, but once you have felt the S6 mode its hard to turn it off.
Since I only drive my M5 3-4 months of the year I have to relearn to drive the car at the start of every summer. So its only at the end of summer I start to use S6.
Saying that, this summer has ended already in Calgary. 8” of snow this morning.