Well, I can answer your question as I do have a 2009 Mercedes Benz C300. It has never given me a single problem and with a little over 40,000 miles, she is running like a dream (knock on wood). It has been one of the best cars in terms of reliability and overall feel and also practicality. Mine is the sport model with a few mods and it really is a fantastic car. In my opinion it handles just as good as my E93 but you dont feel all the weight like I do in my E93. It has plenty of power for every day driving and I enjoy driving on a daily basis.
Just a little comparison, I drove my buddies e90 328i and in comparison to my C300 I felt my C300 pulled noticeably harder than the straight six in the 328i. So overall a great car and would highly recomend one. But I do sugest you go with the sport model as they do feel noticeably sharper than the luxury model.
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