Hi, I haven't been in contact with HD for a while due to my having been,,,, away, & I haven't bought a CDI off him, but I absolutely agree with u regarding him using hi quality components etc. I know that he was using the exact same charge caps, timing caps & resistors that I use when I put them together for myself or friends (I don't built them commercially), so yes, HD's will be dependable. I'm not familiar with the other type CDI u mentioned so cant comment. Cheers