It would probably be a good idea for everyone to try and fire one at least once. Just to see what they are really capable of. I once had an oven fire with a pressurized kerosene stove. None of the fire extinguishers worked, not even the halon. Only killed the flames until the oxygen came back. The only thing that really worked was the soda filled one. Don't get caught anywhere in an oxygen lean area when you try a halon, I still have the scars from the scramble out of the cabin after I torched off one of those. And for car fires, the run of the mill small ones we normally carry won't do much for engine compartment fires. I have thrown three or four at some of them, with no effect. It takes a pretty good sized extinguisher to maintain enough stream to knock down flames and get the combustibles cool enough so they won't re-ignite.