I left Central IL Christmas Day for Sarasota FL (30 degrees). Pulled back in my drive 5 days later (19 degrees). I used Powerlet heated glove liners, you can get a simple glove liner kit for 125 bucks: http://www.powerlet.com/product/rapi...-liner-kit/543

The powerlet heated glove liners worked great inside of my Klim PowerXross Gloves which are waterproof Gor-Tex (not too bulky, windproof, waterproof & $100): http://www.revzilla.com/motorcycle/k...erxross-gloves So if you want to avoid frozen fingers heated liners & gloves are about the same price as the grips but much more effective IMO.

As a side note, at fuel stops I would remove the Klim gloves and leave the heated liners on while I was refueling. The liners are pretty thin providing good tactile feedback yet they keep your hands warm during fuel stops (especially if you remain plugged in as I do). The Klim PowerXross gloves are great Spring / Summer / Fall gloves (without heat, and provide decent tactile feedback). This summer a group of us rode 4 hours in 60 degree rain and I was the only one with warm dry hands (everyone else was miserable).

My F6B has heated grips which are nice in the spring & fall but once it starts getting below 50 degrees for extended periods you will want to put gloves on which somewhat defeats the purpose of heated grips. Certainly if you are going to put insulated gloves on then heated grips are of very limited use.