I like to think of this article as "tales from the dark side!" Plus I think the article is relevant to this forum: Will King of King Of Shaves writes about some of the technologies that go into today's modern razor cartridges, other than blade count. Will and I became acquainted on Twitter a few years ago and we've had some really interesting discussions over that time. Personally, I've always thought the idea of a pivot in a razor is a sound one, and there are even some single-blade razors that have them (OneBlade, Focus Dynamic, Gillette Guard, etc.). TL;DR-- Five things are key: The blade edge and coating. How the blades are held in the cartridge, and the exposure/spacing between them. The ability of the cartridge to maintain contact with the skin at the pivot point. The inclusion of a lubricating strip to aid glide and comfort. Skin Tensioners & Edging Trimmers. Gillette’s Sensor nailed all of these key attributes, and the introduction of Mach3 in 1998 further reinforced Gillette’s dominance.