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I have a 12 volt heater I use in my TDI. I don't turn on the heat in my car until the water temp is at least 100 F and I use the 12v heater in the meantime. I also shut down the heat when idling.
It's useless to heat the cabin. It could keep your bare hands warm provided you keep them within a couple inches from the heater, but that's it. I got it velcroed right next to the windshield to keep a tiny spot from freezing over, so I can still see something until I get warm air from the heat exchanger.
It also have the advantage of putting an additional load on the engine, though not much, which helps it warm up faster.
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