Older models, with the smaller monochrome display, usually displays the audio system level each time you start the car.
Newer models (with Sensus, larger colour display above the center stack) don't. But if they have the top level Premium sound system, then there's a logo about that below the DVD slot.
4C allows the car to change the shock absorber damping level as you drive. If you always leave it in the Comfort setting, well, then maybe a standard suspension would serve you just as well. The electrically controlled shocks are significantly more expensive than the standard ones, should one fail.
I didn't get 4C. I frequently tow trailer/caravan, and 4C couldn't be combined with automatic levelling.
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