There are so many different Gillette razor blades. You know what I'm going to ask. To be honest, I can't figure out how there can be very many differences between blades. I've tried a few. Feather was super sharp and shaved great. Personna and Dorco don't seem to be as sharp as Feather but still give a great shave. "Razor sharp" is relative, I guess. Derby was literally painful to use. I threw them out. So, there are a lot of brands, and they may or may not be different. (For example, I couldn't tell you the difference between Dorco and Personna.) Then you have Gillette manufacturing a thousand varieties (give or take ). It's just hard to believe Gillette is doing more than making blades and just putting different names on the same blade. (OK maybe a few difference but not as many different varieties as they have.) OK, let 'er rip. I'm prepared.