I have all of their current carbon offerings. Dura-Sharp is likely the sharpest, Classics are sharp and smooth to me. Black Beauties work and are beautiful to look at. Falcon, Silver and New Steel have been hit or miss for me and the New Edge was awful in anything but my DOC which turns any nasty blade usable. If you only get one I recommend the Classic for sharpness and sound. I have a very rough afro beard and they do the job well. I didn't mean to turn the topic of the thread. Hope the carbons sing for you when you get themThanks so much for the insights. You’re right, I’m in Poland, but it’ll be easy to get the blades and they cost very little. Helps me a lot to know you favour the Treet Classics, as I have no experience with Treets or indeed carbon steel blades.