Sorry to hear about the problems that you have had. I have had mine for two months and the only QC problem that I had is a scratched windshield - did not notice it for 3 weeks. It was replaced without question.

That said, the 335 is a beast. I would see no reason to wait for the M3, I could get enough demerit points with the linear power of that E92. My brother-in-law who sells Mercedes cries every time I mention the 335 - they have nothing like it. In fact my wife is talking about trading her 5er for one.

Enjoy the 335.

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07 X5 E70 4.8i
04 Z4 E85 3.0