Besides the cool factor and it looks awesome, you also lose 6 pounds of unsprung weight.
With the money I save not racing and buying lots of tires, I might be able to afford it! haha6lbs = 2.72kg
Surprised the std swingarm is so heavy, its wafer thin.
If I was racing in a series that allowed such mods, I couldn't afford to be in it,
and certainly wouldn't be on an R3 with such open regs.