i had an 08 335, sport pkg, etc. the prior car was a 4cy honda accord. i went from 150hp to 300hp in 2 hrs. needless to say, i drove the shit out of that car. It was incredibly fun to drive.
i've got a 328 coupe with msport now. and i've got to be honest...the 1sec longer to 60 doesn't even phase me. the naturally aspirated engine is more fun to drive as you get the rpms between 3500 and 6000. i've added a better air box to it and will get it re-mapped eventually, but even now, I can spin the rear tires without much effort. So i have to say, i'm a fan of the naturally aspirated engine as there's less to go wrong with it and it's rock solid.