No...not quackery , as they do as advertised. You just have to have an engine that requires it. I've seen Funny Cars on Nitro using them. As these engine shake a bit, the block mounted grounds do their job, and these wires will run BIG amps down them. The blowers on these engines can acually BLOW out the spark plug , like you would a candle. Some of the folks in 'Forced Induction' might use them.
As for you and me....
AfFORDable new wires and an Accel coil and all will start at 40* below......