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I have had 12v for 10 years on one car, and the other car that I acquired has been 12 volts for 30 years. I would never go back to 6v unless I was doing a show car, but I'm also not a purist. Out of the 6 model A's my family has, not one is 6v and we have never had any electrical issues or regrets. Anyone who is going to be driving their car regularly in today's world has a convenience factor to consider as a main reason to switch to 12v.