Any information is good. If you take the knowledge from the videos an old gunsmith and others. You can use what works for you. Not every method will work for you. I went to a school and I have the AGI courses plus alot of books. I will always be able to find the safest way to fix something.Judging by the DVD I bought from them about Ruger double-action revolvers, they are pretty useless. If they use material from the individual DVD's they offer, it's money wasted, as was mine. The info that Iowegan offers (on another forum) was more useful, and that useful stuff was in text, not video. That should explain a lot. The AGI stuff even has poor, time-wasting direction, where the person on camera waits for off-camera prompts to say his piece. Save your money, unlike me.