I've only been DE shaving for about a year and a half so I still have much to learn. I'm wondering if any of you experts have had the same kind of blade variability (within the same brand) as I've experienced. I'm using wonderful blades (Gillete 7 o'clock sharp edge - yellow pack) and getting great results with them. But the length of usage I get out of each blade can vary considerably. One blade (only 1 in one and a half years) I had to discard immediately. And my most recent blade lasted 2 weeks. Usually it's one week. Have any of you more experienced guys had experience like this?