I have taken two of them so far. The Foley/Belsaw course and the now defunct NRI course. Mr. Keenan is right on the money. The courses did teach me a lot about repairs, especially to older guns that are hard to find info for. They taught me some valuable skills also. Mostly they taught me to "think like a gunsmith" and to trust myself. But they didn't teach me enough to go into gunsmithing as a business.
Personally, I recommend the AGI videos. They cover each gun in far more depth and give a lot more useful knowledge. They still won't set you up to go into business, but what you gain from them is worth the expense.