To keep this bike on track, with all the little extras, I decided to install grip heaters as well. I personally haven't had problems with cold hands very often. Once in a while if they get real cold it takes some exhaust to recover, then all is well the rest of the day. I will see if these are a good extra or not? A little low heat in your grips all day might be real nice? I will see....
I got some "single density" grips to allow heat to transfer through them better. The thick "pillow" type grips may never get warm. I am going to wire them isolated from the battery so there is never a risk of running the battery down. They will have an "on and off" switch that will function normally, but when the engine is shut off, all power stops to the grips regardless of switch position.