I recently tried Treet Black Beauties, Treet Dura Sharp, Treet Falcon. All of them shaved me very close and without irritation. Only difference i found. How blade feel on the skin and sharpness difference. To better understand. I have very short, thin and strong (pitch black color) stubble that grows only on certain parts of the face. Feather is one of my favorite blades. Carbon steel shave as close as Feather. How? I'm in slight bewilderment. Because in comparison with stainless steel. Most of them cause me discomfort and shaves not as close as Feather. I'm not getting a huge irritation as it was in the past. I'm a lot more expirienced as it was two years ago, when i started out. But even with my experience. I'm still getting few "burn spots" with stainless steel blade. Why it's so drastic difference between two types of steels? Maybe metallurgist can answer my question?