C63 handles just fine. I think it has more steering feel than my erstwhile M3 (which I will always love). C63 with the AMG Performance Package ("AMG PP") feels much stronger than my chipped M3 with full exhaust and intake. Yes, I understand the naunces of torque making a car "feel" faster. C63 with AMG PP is faster. I've seen dynos of up to ~430 whp stock for a stock C63 AMG PP.
My biggest complaint with the C63 is the inadequate rubber. I do track a few times a year, unlike most M3 owners, thus what I say comes from someone who has driven the M3 "on the track" - many of the comments on the C63 (post suspension overhaul) are plainly overblown - we forget that it is faster on the 'ring than a M3 and that was on stock Contishits.
I prefer the C63 around town as it pulls anytime while sounding good and I don't need to rev the piss out of it to get pull; I do miss the "comfort" setting on my M3's EDC; the C63 does ride harsh. Surprisingly (for me given displacement), the C63 AMG PP feels like it revs just as quickly and fluidly as my M3.
Current: 2012 C63 AMG PP | 2012 F25 X3
Past: 2008 E92 M3 | 2009 E90 335i | 2007 Z4MC | 2002 GTI 1.8T | 2000 Celica GT-S | 1999 328i | 1990 Corrado G60
Last edited by DiscoZ; 04-11-2012 at 02:25 AM.