i have some knowledge here....owner of a 99 kdx200 and a 99 klx300.penguin is right on as usual.my personal opinion is the klx is a great handler,pretty much trouble free bike.with mods header/carb, it's a very nice runner too.seat ht hurts me some...6'1 i have learned to deal w that.there r situations where the klx is easier to ride as penguin mentioned.i had trouble w stock kdx suspension...mine is not stock and is equal or better ,matching klx handling is not easy.i give the kdx the nod in...power,power delivery,wt,flick and feel.i've grown to love those kdx qualities and wish the klx had more of that.my kdx starts inside 3 kicks under any situation,not so w the klx.i enjoy both ,nothing is perfect ,both bikes have positives /negatives on any given day far as what ur doin and where ur doin it.there must b a reason i have both in the garage,besides to drive the wife nuts ;)