I don't find the first shave with most blades that great. I am guessing the edge is still a bit 'jagged' at the microscopic level. I usually find a sweet spot with most blades at shaves 2 and 3 and then notice a fall off around the 4th so I toss most of mine at around 3. I am pretty impressed with the Rapira Platinum Lux blades at the moment so I might try and seek out the edge of it's service life at some stage.