I bought the 2009 M6 last week, it's already in service. With two problems, mind you - pretty minor, but still. One, the heating system did not work properly - radiator needed to be bled. Two, one of the air vents, driver side on the left, did not open. Some broken peace of plastic the dealership did not have in stock, it needs to be ordered, and then I have to go back again to have it put in. I bought this car because I had 250 k on my old Accord, I thought it's getting to old, and did not want to spend time in repair shops. I had one minor issue with the Accord in 10 years, at around 180 k km, and with Mazda, 2 issues in the first week.
Handles nicely, great exterior design.
Little interior storage: no pocket under the dashboard, no back door pockets. Revs more than other cars, or at least more that Honda and Toyota: at 90 km/h, in 6th gear, it goes to 2300 rpm, Accord does 1900.