I also have a slight bit of anecdotal concern as someone I know bought an 08 and after a month of ownership the engine went bang, I don't know what happened, but being rational about it, that was one of the extreme very few, it's just I happened to know him.
Always a toss up between the C63 and E55, but has to be an estate and there are a ton more c-class to choose from, and that engine noise is such a pull