Parallel ignition systems, anybody tried running one?

I have the blue "Hi Rev 7500" like Ehrenburg sells, though I got mine through Amazon and it came in a Jegs box. So far, I'm impressed with it. It runs good. I've actually thought about a tandem ignition like you're talking about. The NASCAR boys used to do that way back when. Two complete ignition systems. If they had a failure, as long as it wasn't the distributor, they could throw a switch and keep on truckin. It's not a bad idea.