I put them on my wife's Nighster.
They are outstanding-- and the led control panel that replaces the clutch perch is pretty slick. She has Performance Machine Ano grips and they heat them right up-- and that's a fair bit of aluminum. They're hand's down better than any heated grips I've ever seen.
The website has a pretty good install video and the instructions are pretty straightforward.
If you want toasty hands, get them-- you won't be dissapointed.
USAF: 1989-1997. Desert Shield (Saudi Arabia), Desert Storm (Kuwait, Iraq), Provide Comfort (Kurdistan), Restore Hope (Somalia), Uphold Democracy (Hati), Joint Endeavor (Bosnia), Support Hope (Rwanda). USAFR: 1997-2014. Iraqi Freedom (Iraq), Enduring Freedom (Afghanistan). Retired, Oct. 2014.