While I was on amazon I noticed that Gillette put an interesting claim in their FAQ for the ProGlide, though this should apply to any multiblades really.
http://www.amazon.com/Gillette-Fusi...=UTF8&qid=1349210394&sr=8-5&keywords=proglide
That's right, they said their research demonstrated that single-blades are "demonstrably inferior" to multiblades. What do they mean by this and how did they quantify inferior? How did they even demonstrate it either. If it's anything like their unsubstantiated claim that vibration of their razors give a better shave, then that should have been something challenged as well.
What is the difference between a single-, double-, triple- and 5-blade razor? Which is best?
Gillette's research has demonstrated that single blade technology, which has been applied since 1901, is demonstrably inferior to twin blade shaving systems such as SensorExcel®, and even more so to 5-blade systems such as Gillette® Fusion® ProGlide®. But the number of blades alone does not ensure a superior shave. The 5-blade shaving surface of Fusion ProGlide Manual and Fusion ProGlide Power® features progressive blade alignment, an advanced blade coating process and a flexible comfort guard which collectively provide Gillette's best shave.
http://www.amazon.com/Gillette-Fusi...=UTF8&qid=1349210394&sr=8-5&keywords=proglide
That's right, they said their research demonstrated that single-blades are "demonstrably inferior" to multiblades. What do they mean by this and how did they quantify inferior? How did they even demonstrate it either. If it's anything like their unsubstantiated claim that vibration of their razors give a better shave, then that should have been something challenged as well.