Aside from needing cable adjustments to fully close, some clamps, and some heat tape in some spots for good measure. They are working. I've never had heaters before. My buddy back when we were kids had them on his Baja. They burned us out of the car on those cold southern California days.

I took it for a spin for about 15 minutes. The vents under the back seats were jammin. I see the cables that I guess should be to close those for more air up front. Not there of course, but not too worried. A bit of air on the floors. The plastic on the windshield was warm. Seems to be a good start. Now it will start to get warm and I'll plug em I'm sure.
So who is using them? What are your pros and cons? Do they keep you warm enough in your climate? I imagine they would help with rust issues.