On a whim, I decided to try one today. I am currently on a run with a Schick Stick and a Proline blade, was 12 shaves into it. I have a brass injector blade cartridge that came with my cased E2. So I lathered up, loaded a blade in the E2, and started shaving. It seemed sharp enough, but I certainly felt the blade at work. I found myself having to use a bit of pressure to make the shave work. I got my WTG pass done on both cheeks and upper lip, and decided not to push my luck any further. I went back to the Stick, and completed shave 13 with it. The difference in the amount of pressure NOT needed with the modern blade was astounding. I guess it was a fun experiment, but I won't be using vintage carbon blades again. Never tried the vintage stainless blades though.