I find that Feather is overkill. It didn’t shave better for me than any other blade but it cost more. Israeli Personna’s were good. $15 for a 100.
FYI...
I used Israeli Personnas many years ago - OK blade but nothing special.
I have 2 Edwin-Jagger (UK) razors - both with same 3-piece E-J head. EJ recommends Feather & includes a Feather with these razors.
Feather is overwhelmingly accepted as THE sharpest blade and also has the best quality (from the Japanese medical blade company) albeit a bit costly at 40-cents/blade.
That said...
“Perma-Sharp” (Russian Gillette) is very, very close to Feather in sharpness and far superior to any Personna.
100 blades for $9.49