now that you mention it i see someone was just asking about it earlier this month in the Big and Dandy Methylone Thread at http://www.bluelight.ru/vb/showthread.php?t=5543501 , apologies for not looking there first.
the difference in effects between enantiomers seems to vary so greatly from substance to substance that i was hoping by now someone had at least an anecdotal report if not a url to a journal article somewhere on methylone specifically...