Speaking as a C class Production shooter and being brutally honest with myself, these guys are telling the truth. I'm at a level where I'm competent, and I feel that I would be likely to "win" in a real-world defensive encounter, but I 100% know that if I dedicated the time, effort, and money (ammo) to it, I could get a LOT better than I am. Maybe not quickly into M, but at bare minimum, moving from C-->B, and then probably A, should be something I can do.