I had the odd Dorco ST301 (orange wrapper) packed away in a sampler that came along with a DE razor I bought on the bay a few months ago. Even though skeptical, I threw it in my 2011 R4 and it yielded a great, super-smooth shave, followed by two more sensational shaves in my Fatip Piccolo fitted with a Weber Bulldog handle. I really didn't notice any considerable degradation after three shaves, which is on par with Med Preps for longevity in my case. I liked it so much I couldn't resist buying some more, even though I'm well-stocked on 'go-to' blades in the first place. The price is amazingly low as well. I have to hand it to Aimsport for his recommendation; these blades really pair nicely with more aggressive razors.