I find it difficult to believe people can't tell the difference between the modes, the difference is quite large and passengers can tell with their eyes closed (even 9 yr olds).
It's a real mood thing. Comfort on a rainy Monday morning to work avoiding the potholes, Normal/Sport on a weekend blast.
There is a big difference from my mk5 which had no AAC. Also in case you didn't know it is adaptive and so is constantly changing to suit conditions/driving.
Magnetic or pneumatic - not sure. I was under the impression it was a electronic/magnetic system, could be wrong.