I had already Derby blades which I found absolutely great! Was a real eye-opening experience and I thought I had found "my sword".
Nope! Property me then a pack of 100 purchased and was quite disappointed. Nix with more gently sliding, sharp, gentle and best shave. Apparently Derby does not have much to do with Derby :(.
Perhaps the 100 packages are not the same product line, intended for other markets or whatever. I just always wonder whether the replicas are, but apparently Derby actually so a fluctuating quality.
If I have the shitload blades finally gives, I will not buy any more derbies!
Then I buy louder 5er packs of other manufacturers and test by. Mercury I still have very good memories ....