I have both a double edge razor and a cartridge razor. I used to use the double edge razor more. I now use the cartridge razor more, for two reasons: first, it

I have both a double edge razor and a cartridge razor. I used to use the double edge razor more. I now use the cartridge razor more, for two reasons: first, it takes less time. Second, I figured out how to make it cost less money and generates less waste. The trick on the latter is that I discovered I can keep a single one of Target's store brand Mach3-compatible cartridges going for 3-ish months. This was due to a combination of tricks I had already been using to keep Mach3 blades going for a while (dry after use, store in a dry place, strop before use), plus the more recent discovery that Target's generic blades are higher quality and greater durability, at a fraction of the price. With double edge blades, on the other hand, I can get two shaves out of one, tops, before it starts to give me nicks. I've tried stropping these blades, too, but without much success. So that works out to me being able to get about 2 years' worth of shaves for about US$7 with the cartridge razor. I'm not sure what the exchange rate is right now, but I think that works out to about 1/3 of the £10/yr that the author calculated for safety razor blades. (On the other hand, I can definitely get a better shave out of the DE razor.)