I agree with you Ron. Blades as most of our shave kit is extremely subjective. My gripe is that many dudes state that the Kai is as sharp as a Feather. In my case it is not. It shaved no better than a Merkur which was a very poor blade for me. I also shave face and head each shave. One use and I bin the blade. I found my shave’s deteriorated in comfort when used more than once. Regardless of which blade I used. Multiple uses of a blade does not make it sharper no more than multiple uses of any other blade, scalpel, tomato slicer or any cutting instrument. Each use wears the edge, and that’s physics. Shavers who adapt their shave technique to accommodate this, get great shaves for themselves. That doesn’t make the blade sharper. I also agree that the bevel by the manufacturer, the steels used, coatings etc all come into the mix as to the longevity of a blade for a specific user with a specific whisker growth. There are some serious blade campaigners amongst us. My write up and test comparison of the two blades did agree with the tester’s experience. That does not make it categorically correct for all users. My test was also based on a single shave. Not multiple shaves. I like everything about the Kai, except it’s sharpness for me. I do wish people would stop saying it is as sharp or sharper than a Feather. That’s what irks me.I remember the fellow who did the testing with his neat set up with kown weight pressure before test line breaks from blades he was testing from and is recorded, but I look at it differently then he did. If a DE Blade like the Kia SS lasts me 10 shaves repeatably from excellent to great shaves and other blades generally about 6 excellent to great shaves and tossed it indicates that the grind or heat treatment of the blade or steel used is better than the other brands. A DE Feather at 6 shaves is tuggy because the cutting edge has been blunted or fractured, with me the Astra SP can get 7 great shaves.
It's the edge that Feather puts on their blades and the steel they use is not designed for longevity IMO, I use the Feather FHS10 in my Oneblade razor and it is one of the nicest shaves on only the first shave and #2 use it drops off quickly and becomes scrap and is Binned.
So if I get 10 good shaves from the DE Kia SS blade & then tossed it has to be sharp regardless of a mechanical test indicates, the mechanical test is only telling a person the edge is finite or ground and stropped to a higher angle but is weaker overall for longevity. The tester also head shaves with his test blades to confirm his testing and that is good + he figures 1 head shave is equivalent of 2 regular face shaves and that is fair for total of 4 facial shaves is what I recall.
So the DE Kia SS blade for longevity and smoothness it is a superior blade to others brands but does not grind and strop blade edge for the finite weaker edge like Feather might. Another point of interest that tester might of not know was the Kai SS blade is wider than the other blades he tested with his test razor he used would have felt it more aggressive possibly!