I just shot some footage of the Manticore abrasive file in action. Just like with my old video on the Lansky stone of the same pattern, I played baseball with a rock and a machete. The rock wasn't as rounded as the last time, and I struck a more solid blow, so the damage was much worse. In spite of that, the Manticore completely filed it out in a hair under 4:30, which is less than half the time it took with the Lansky version. This baby EATS steel.