I had my 2012 M3W for two years...and 15 revisits back to the Factory for fixes:((
BUT I miss it and would buy another one...but only a 2014 version.
I do believe that this "Mk2" is virtually well sorted with most if not all the old issues resolved.
so hope that helps from an early adopter...go for it ...you will have many many hours of sheer fun!