"A local Fein rep convinced me to buy my first box of Falx blades last fall, explaining the story behind them and promising me that if I wasn't satisfied with their ability to cut through nails she would personally give me a new blade. I have a 100 year old house and there are always interesting projects to do. The Falx helped me replace a window header and in the process I used it to cut through a handful of framing nails where my reciprocating saw wouldn't reach. True to her word, the Falx blade went through them, all teeth intact and still sharp. I was so impressed that I gave my father in law (who gave me my first Fein Multimaster) a case of them in his Christmas stocking. The Falx is now the default blade for any project and I'm always happy that I don't have to worry about ruining it if I'm not sure what's below the surface of my plunge. I have to say this is certainly the best value of any Fein blade I've used."