2011 + are safe and have revised head bolts.
Brakes, tires and oil consumables are very expensive, even worse if it is a Perf Pack. 255/35/19 in PSS are 380 CAD a pop, plan to go through these easily under 10,000km, more like 5,000 if you have a heavy foot in city driving. Brakes have a much lower life expectancy than M brakes, they'll need a change every 50,000 and they are 2 piece rotors on the Perf Pack cars ($$$).
Depreciation is also starting to hit hard on these, as it always is in this market segment, M over AMG when it comes to used purchases due to lower running costs including maintenance, repairs and depreciation.