I will add for anyone reading that the ACC system is great. My parents just got a new 300 C (I'm getting mine in a month or two) and I would absolutely not consider getting the car without it. It is surprising how useful it is!
Not having ever used it before, I would have never guessed how nice feature it is.
If you did only 100% city driving I could see getting away with not having it but if you do freeway driving even once or twice a week or the long road trip every few months it is TOTALLY worth it.
I will say the first few times you used it it is at a little bit a matter of faith to let it slow you down from 70mph to 35mph – I know my heart was racing and it was definitely a strange feeling to get used to.
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