I put on a set of Hot Grips. Easy to install, cost about $100. The grips are larger than stock, and fill my hands better = more comfort. They are available with a variable control, but I went with the three position High-Off-Low switch. To me, they make a world of difference at 40 degrees. They do get hot. Mac
As soon as the Old Lady lets me spend some money I intend on installing some Hondaline grips from a ST. Found them on a British website. Guess us Americans don't buy so many heated grips. It got a cool digital display. Says it takes a special wiring harness to hook to an ST. I'm sure my multimeter and I can figure something out. This will be way more trick than those heaters with the dial control.
I got a set of the Honda Factory heated grips with some other forum members about a month back. http://vfrworld.com/forums/mechanics-garage/10574-heated-grip-install-write-up-lots-pictures.html Thursday was beautiful during the day between DC and Baltimore, but the 80 mile trip back home from my son's soccer (football for the rest of you) match was a wee bit nipply. Temps. started at 57 F. and dipped to 44 F before I got home. The grips were great... and I used the "frying bacon" setting to good effect. If you search, you'll find the info on the grips, costs etc...
The one I saw was a LCD display with buttons that would have to mount on the grey inner fairing. The flat spot just under your handle bars on either side. Just have to cut a square hole and hope I don't jack my harness up too much. Would look very intergrated.