I don't know what the eye rolling is for, but yes.. it is a Revloc.
http://www.RevLoc.comThere is one available for the KX500, and from what I've read about the different manufacturers the RevLoc is the best. You still have the clutch lever to over-ride it and you can adjust the RPM it kicks in at by changing the stiffness of the springs. It's really neat how it works. I wouldn't have spent $1000 on it, though. It came with the bike.