actually swingarm and proarm the difference isn't really much
lah, some amatuers like us, FEEL WAT DIFF?!?!
ya it is true that pro arm does provide more stability to the
wheel, but becoz it is only 1 sided, it is extra thick and
heavy to make up for the missing right side.
thats why u nvr see pro arm used in GP racing. u see katoh he oso
dun wanna use pgm4 pro-arm, he use pgm3 gull-arm.
gimmick only lah 
another good reason about proarm is becoz it is only 1 sided,
therefore change tyre as well as align tyre = very simple.
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vroom...tingtingtingtingti...vroom~
