If noise is likely to be an issue then G56 is the right decision. However, at speed there is no noticeable increase in noise (to the occupants) even with the MMC version and long journeys are no more tiring than with a standard exhaust.
I agree with all the comments above except to say this. When the inevitable crowd gathers and you press that start button, the MMC Stage 1 doesn't disappoint.
Do my neighbours sit bolt upright in bed when I leave early on a Sunday morning. Probably.
