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I enjoyed reading this comprehensive posting on the M's features and faults. I own a 2009 M35X. The car has been an absolute blast to drive. Looks like between 2007 and 2009, a number of the original issues from this posting have been fixed by Infiniti. The big issue I had was the "Tram lining" that would happen on uneven roads. once I changed my tire to Michelin Primacy MXV4, this problem went away.