 Drove the CTS-V before the C63 AMG.  Got such a great deal, never bothered to drive the M3.  CTS-V was a boat compared to the C63.  Such great responsiveness and a feeling of complete control with the AMG.  A friend of mine put it perfectly:  This car feels like you are driving a go cart.  Hard to pass somebody without getting close to 100. So much faster than my Lexus GS 430. Can't wait to fire it up to hear the great exhaust sound.  Sounds more like a lamborghini.  Also like the fact that it is a sports car with four doors so can put the kids or cargo in the back. Would definitely buy this car again without hesitation!  Simply AWESOME!