These are super sharp! 5 blades and you can skin an entire body!

Just like one of my Japanese animes.

Works better for me in a less agressive razor.

Feather is sharp, but I always found them a bit irritating and short-lived (three shaves max) when used in a variety of closed and open comb razors from Merkur and Muhle. (I ended up choosing Astra as the best all-rounder for cut, comfort, and durability). I was recently gifted a Rex Envoy, and I tried the Feather in it. Completely different experience! Such a smooth and comfortable shave! Can't speak to the durability yet, but after four shaves there's been no noticable difference.