This is great lock, Ive had no issues with mine! Provides a little extra comfort, the disc lock will go off if someone sits on the bike and moves the handlebars, or roll it in the slightest. The instructions say if you want it more sensitivity arm it higher up on the rotor and lower if you want less. I always mount it near the bottom, if you put it at the top a squirrel running by will set it off.
Another good feature is if you accidently forget it is on your rotor once you start the skoot the vibration from the engine will set it off. It's annoying as hell but better than going over the handlebars!