I don't think that Dave sells anything that competes with a nology coil, friend. He sells a CDI that would compete with Dyna. And, FWIW, I'd listen to 2nd hand info that Dave trusted than almost anyone on HQ. Do you need to buy a cub cylinder yourself to believe that they perform extremely well?
So, if I gather from you tone your opinion....Dave wanted to take time out of his day to discredit a product that he has no vested interest in, one way or the other. If anything, it makes me respect him more. Some builders would say, hmm...dunno, but I can have one for you in 3 days, and make $20 bucks for his time.
As for if it provides performance gains, I'm willing to pay for dyno time to show it, so I must be open minded enough to give it a shot, just not willing to fork over the money to buy one myself.
Now, onto possible electrical theory. CDI's basically rely on some basic components, mainly a capacitor. The cap, after being charged by the mag, discharges with the primary side of the coil in it's path. This creates a current in the primary coil that transfers to the secondary, thus firing the plug. If the turns ratio of the coil is higher, more voltage will be developed, true, but the load on the cap increases proportional to the square of the turns ratio. So, getting the higher voltage spark, means that the cap is gonna discharge faster - ie, shorter duration.
I don't know of the optimal figures for spark duration or voltage. But, I can understand the reason why this coil would or would not work better than stock.
If you read my first post, I wondered if there was a CDI to CDI variance in the effectiveness of the coil.