Thanks for the review. I didn't test drive cars back to back but came away with a similar impression. That the M adaptive is so much worth the extra price for 'enthusiast' drivers.
After testing the regular sports suspension, I still preferred my E92's drive, despite the trashy ride due to the (older generation) run-flats.
Then I got to try the same car but with M adaptive suspension. Now that was a car I could get behind.