The main benefit of m2 is greatly decreased paperwork sent between your Lodge and the Grand Lodge office. You will be able to submit all routine member updates such as initiation, passings raisings, address changes, death notices, suspensions, demits, etc. Once you enter information in m2, it's in Grand Lodge's database. Done.
Classic MORI also syncs with m2; all information entered into Classic MORI or m2 is in the same Grand Lodge database, it does not need to be entered more than once.