Review on Derby Extra Double Razor Blades by Tonya Fisher

I ordered these blades in June 2016 and they have lasted me 19 months with the blades changed every 3-4 days. This was my first shave with a double-edged blade. I chose the Derby because it was the one that came with my Edwin Jagger razor. I really like them a lot! Foolishly I decided to switch to Feather Blades when they went out and was very disappointed with what I had changed. Feather blades were twice as expensive and much more "aggressive" than derby blades. I often end up bleeding from feathers, which almost never happened at Derby. Although I have most of the Feathers box left, I'm tempted to reorder the Derby because I liked it so much better. And basically, $10 for over a year and a half of shaving is insanely economical. It's like 3 cents for a shave or something. To be honest there were a few derby blades that seemed to pass quality control but I was certainly pleased with the quality and the shave I got from them.