I use the Warm 'n Safe remote troller with batteries. This is my 2nd winter season on the same batteries. Still working fine. I swap my gear between bikes, and having the battery troller, I can transfer it to different bikes as well. Works really well. I could not be happier. I Velcro the troller to whatever bike I'm riding, plug in my gear to the hot coax connector, and ride warm.
I did 200 miles on my C14 in the north Georgia mountains yesterday. Temps never got out of 40s...I stayed toasty at 50% or so on the troller. Gear is not nearly as effective when I move it to my KLR, due to less wind protection, and less robust electric circuits.
I give the Warm N Safe troller a 9 of 10...and I almost never give a ten.
Next project is to try to use my Warm N Safe gear at football games using the new anti gravity battery. We will see.