I did this upgrade on my 2010, 22k miles. Very easy to do. Clutch pull is a little bit lighter (not a fantastic improvement but better than it was). The clutch engagement action feels more mechanical than before, and I believe it is due to the 3 ramps on the new clutch hub (you can see these on the new part). The new clutch plates have reinvigorated the engagement, and it feels brand new.
Then I thought about it a little more. Is the slipper clutch actually an improvement? Might the best idea be replacing your clutch plates with new/stock from your actual year? Some riders may need help downshifting so they do not accidentally lock up the rear wheel releasing the clutch lever. But none of my experienced riding pals has this problem. We know how to ride. (controversial, eh?) Heck, the slipper clutch may be an "improvement" that came in the same basket as traction control, anti-lock brakes, and etc. After I had spent the $300 or so bucks and performed the parts swap-out, I had that nagging thought that new clutch plates might have been all that was necessary.
BTW, the Youtube video referenced above is very good. He was delirious about the lighter clutch lever pull! OK, I'll admit it, any easing of the lever pull is good.