I fabricated a custom mount for the controller and mounted it in front of my brake master cylinder, using the master-cylinder bolts to hold it in place. I wanted the install to be clean and this hides the controller from view when off the bike.
The grips have four settings and a voltage monitor that shuts them off if battery voltage gets too low. I've installed a relay off of the running lights to power them so they won't work if the key is off.
If you do a lot of cold riding, I'd recommend a pair!