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i take it back, keep your shitty Duc outta shitty mcbikefest!!!
BTW, I know ya didn't say you wanted an edge over the EX, but if one of your reasons for getting a 620 is to be more competative in other clases but still be legal for ptwins, well then yeah, whatever bike gives you that will obviously give you an edge over the EX500... I think that's what the fuss is all about.