I tested some razor blades lately and here are my comments.
Merkur platinum are basic blades which are dull IMHO and sometimes one side is sharper than the other.
The Nacet blades are cheap Gillete-style blades which are good if you can find them for really cheap. Nothing special though…
The Filkinson white label blades were so bad that I didn’t want to complete the shave with them.
The Feather blades are infamous for their sharpness. They are sharp but not as sharp as I thought. They are good blades for a very good price.
The best in my list so far are the Bic razor blades made by Astor in Greece (where I live). I really didn’t expect that!!! They are sharp and provide a comfortable shave for a very low price (.25 cents per blade in my local super market 
). They also last longer than all the other blades I tried (5-7 shaves).
So far the best blades were the Feather and the BICs. If you can’t find the Astor made BICs try the Feather. I am also going to try the Swedish Gillette blades.
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