C63 S sedan owner.
After my wife insisted we test a Cayenne and she started eyeing Range Rovers, my son and I conspired to redirect focus. So, this took the place of my beloved (2nd) E90 as our family car.
Generally speaking, car has a very different vibe as compared to M3's. Modern tech and transmission aside, it reminds me far more of my E39 M5 than my E90s or an F80.
I have a '20. Basically fully loaded, I think.
Engine is killer, enjoyable 100% of the time, trans is just alright. I am a fan of the interior and tech, well thought out.
AMG you're covering all oil & maintenance inside of the warranty term.
Not really inspired enough for a full review
But let me know what feedback areas would help you out and I can get into more details.