I know I have probably posted this before, but I used to distribute the ARD mags. After several years we had a chanced to do a direct comparison with a Dyna S. This was a 14:1 Suzuki pro stock motor. On the engine dyno, they were pretty equal up to about 5000 RPM, from there the Dyna S made more power up to redline. Probably due to the drag needed to turn the mag. The mag was the CDI pointless.
In any event, we told everyone up front of these results when they wanted the mag. Eventually we quit selling the mags.