Update with Avon heated grips.
Technically, Avon doesn't make heated grips, and as stated on their web site,
"Avon Grips has teamed up with Symtec (Heat Demon) to create the best. .
That means a complex integration (how hard can it be ?) that is harder than at least two companies give credit. I put OEM on my Suzuki V-Strom, and they were totally unacceptable, and the dealer recommended Oxford heated grips, and those really worked.
For the Rocket, after reading on this site about the inadequate OEM grips, I specified the Avons. I just put 1,200 miles on the bike this past weekend for my first trip, and it was chilly enough to want to use the heated grips, and alas, they were no better than the Suzuki OEM grips - unacceptable.
I'm now planning to replace the Avons with the Oxford Cruiser Heaterz grips. And curiously, the Oxfords are much less expensive than the others. Go figure.