I think that the system has been out there for a while. At least a couple of years. The video I watched promoting it talked about improvements over last year’s kits.
I have not used one of these, but having used a belt grinder for sharpening, I can concur with Clay. It is likely real easy to remove metal quickly. If one is not very careful, too quickly.
I would also be concerned about how fast it will go through belts, which are not cheap. Even with 42″ belts, they don’t last long with the harder steels. Due to these being so much smaller, they will wear out that much more quickly.
I have thought about trying one some day …just because it is neat idea and “relatively” portable.
If a good job on lawn mower blades are possible, that would make it even better. I usually get them close with the Kalamazoo, then finish with a file. I still have to wonder… how many blades per belt ??