Interesting! Did Kai design the cartridges too or do they put their blades in the blank KoS cartridge frame? That they are Kai blades bodes well. I test drove it a few strokes on my arm and it seemed to work well. Got clogged but that's typical for a multi-blade. Their instructions and videos (YouTube) say not to use too much pressure, but I think they are on a different scale from DE or SE safeties. It's so light and the hinge doesn't flex without actually pressing down. And videos show users pressing with their forefinger. I had to press on my arm, but: 1) arm hair is not facial hair, 2) I didn't do any prep or use cream, and 3) it was a bit longer than my beard stubble. We'll see!