I have been consistantly great shaves from my Polsilver SI blades but once in awhile I decide to visit a blade from my first sampler pack. I picked the derby this time. I remembered it as a very forgiving blade when I was first learning. Well, one and a half shave later I tossed it. I felt like I was punishing myself for all the cartridge razors I tossed in the landfill. Mr. Derby we are not friends!