I used to use Gillette Blue and Astra SP with my aggressive razors, then switched to Feather AS-D2 and used Kai and Feather blades. Kai are as sharp as Feather in my experience but more forgiving in more aggressive razors. I couldn't tell a difference between GBs and SPs though, just know that I liked both very much. However, I wouldn't use either in my AS-D2, only Feather or Kai.

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