My bike is brand new, 1250 miles. Since I've had it the clutch seemed a little inconsistent, mainly N>1. Sometimes it would crash into gear, most of the time lurch pretty heavily, occasionally smoothly. I've always known about the "Kawasaki Clunk", which I thought could be the issue. It shifts up/down through the gears positively. Kawasakis were never known for great shifting trans, or fit & finish. At any rate, I thought I would try this. I was quite surprised to see how discolored/contaminated the original fluid was once I opened the reservoir. Keep in mind it is a '13, so although new the fluid has been in there a while.
So I got it done, and 2 test rides (brief low speed/close to home then a longer jaunt around town). This seems to have fixed the problem, at least today (you know how this stuff goes sometimes, goes away and comes back). Never had a crash into first, not really any lurching, but just a slight amount of drag going N>1 (this I call "smoothly").
Yes, I know I could've probably had this looked at, and maybe something done under warranty. However, I didn't feel like dealing with the hassle of a dealer apt and probably losing loss of the bike for 2-3 days.