I have a coarse beard and sensitive skin. Thus, I need my blades to be both sharp and smooth. While Feather blades fulfill these requirements quite well for two shaves, I can seldom get through the third shave before the blade starts to feel harsh.
With most other blades, I can get three shaves and sometimes four, so Feather blades just are not cost effective for me. There are some blades that are simply not sharp enough to use for a single shave: Derby Extra, Shark Super Chrome, Merkur, VDH and likely a few others I have not tried. I can shave with Astra SP, but they are not sharp enough for a close, comfortable shave.
With most other blades, I can get three shaves and sometimes four, so Feather blades just are not cost effective for me. There are some blades that are simply not sharp enough to use for a single shave: Derby Extra, Shark Super Chrome, Merkur, VDH and likely a few others I have not tried. I can shave with Astra SP, but they are not sharp enough for a close, comfortable shave.