For the past couple of years I've been using the BMW vest that I bought before I got my RKC. While I've heard people say that you don't need heated clothing in So. Cal. I would respectfully have to disagree. There is nothing worse than being cold and the heated vest has provided me with many a safe passage home. I think of it as a safety feature as my thoughts never wander to think about how cold I am. I've considered getting HD's heated grips, but haven't heard anything good or bad about them.
In case you can't tell I'm in favor of heated clothing.