Shaved this weekend twice with the KAI blades and the R41.... Very smooth, very sharp, got great shaves but, I was very cognizant of what I was doing. I had yet to use an "aggressive" blade in this very great, aggressive razor. I Must say, on my neck the difference was telling. Close, the first pass and not the third. I had been using shark blades in this razor since getting it a couple weeks ago since I find them forgiving. With the Kai, one pass on neck, two on face, and both were BBS. I also believe I will use these blades for four shaves and not my normal two I use with other blades
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