I recently purchased a blade sampler pack from Fendrihan, Classic Wet Shaving Store containing Merkur, Derby, Feather and Astra. I have used the Derby & Merkur. Today I tried the feather and found out that it is truly Ninja katana sharp ! I highly recommend this blade ( as long as you have some shaving exp) as it was one of my most closest an most comfortable shaves with my shavette.