I was introduced to some Firstgear heated vest and gloves last year after I froze my baggets off on a road test to Vegas in December. The temperatures in Los Angeles have been dropping and I had to ride home in 39 degrees this week (weak I know for some parts of the country) and I decided it was time to pull it back out again.
I have Firstgear heated vest and gloves. The vest goes under a jacket and the gloves plug into the vest. Everything is controlled by a small box with a dial on it that mounts (via Velcro) to my gas tank.
The temperature was around 40 degrees and I plugged in and took off. Within about 3 minutes my body was up to temperature.
Riding in cold weather with heated gear is a lot like driving around in winter with your windows down and the heater blasting. It's almost comforting.
All I know is I don't think I can ever go back to non-heated gear, during the winter at least.
www.firstgear-usa.com