I can see a great advantage in reduced heat times, no fuel consumption, and a safer work environment (assuming it's really safe that is) than burning fuel, however, I am left with a concern on how they work specifically with knife blade shapes. My concern is over-heating the thin edge which is obviously an integral part of a knife or if this is even a concern at all. I know odd shapes can be worked by these machines but that's only been shown to me for general blacksmithing and I wonder if any bladesmiths have employed this forging tool yet on knives?
BTW, I'm particularly impressed with the pancake coil over fire brick set up for blade work, seems ideal.