Here I thought Feather blades were the ultimate. My first two shaves with Kai blades have been revelatory. I loaded one into my Edwin Jagger 3ONE6. It made that interesting crinkling sound as I ******* the handle onto the baseplate/razorhead combination. My first two strokes, the blade feel was very prominent, nearly disturbingly so. By the third and fourth strokes there was practically zero blade feel through the rest of the shave. No nicks, no cuts, no errors. Second shave, no sensation but that of a mild, close shave. I nearly didn't need a third pass for total smoothness -- in fact, the third pass was more like a routine clean-up pass. Again, after cleaning the razor and reinserting the blade, there was the crinkling sound as the blade perfectly conformed itself to the razor's engineering tolerances. If this keeps up through four shaves, this will be my new #1 in the 3ONE6, which by the way, beautifully accommodates the Feathers with which it comes packed. But Feathers only get me through three shaves before I notice a marked drop off in sharpness. Oh, and there's this; it's either cool or cooly arrogant -- Kai blades have no branding on the wrapper or blade. There's no logo, no engraving; just this beautiful piece of stainless steel honed to a fair thee well wrapped in heavy waxed paper and without glue tacks.