I own a C63 (in real life) without the rear LSD option and it's one hell of a car. Youtube it to hear the craziness that is the stock exhaust! Not to mention it is very, very fast. Sorry, I digress, without the LSD option it uses the latest generation of traction control to simulate a rear diff and does quite a good job at it to, though there are times I can leave double solid black lines of rubber and times only one line. It's very manageable (in the dry...with ESP on) though I'd tick the LSD option if you plan on taking it to the track.
good to hear that 👍