I didn't notice anymore wheel spin with the 51 from the 48, since I've always had to give it some gas, slip the clutch, and launch it a certain way to keep it from stalling. What it does give you, once the idle is setup a little higher, is the ability to keep the hands on both grips more often in the tough, tight stuff; letting you concentrate on your line instead of focussing on having to play with the clutch and keep the bike from crapping out on you. With a 51t the bike really needs a 6th gear for the fast forest roads and such, but for the woods it was as good a step as changing the fuel map!
Might have to try it. It would be nice to not beat the crap out of my fingers with the clutch lever as much.