I've only tried the 6" demo so far, but it was one of the slowest blades I've compared it to. Cut 3 inch branches with a Milwaukee Orbital Super Sawzall in Orbital, Bosch demolition was fastest, then Milwaukee Axe, then Milwaukee Wrecker. Even a cheap old fashioned blade from the 1970's was faster than the Demo Demon! The only knife that was slower was the pruning knife. The Demo Demon cover also stank as it wore off. I can't say how much longer the Demo Demon lasts than other blades, but I'm sure it will last a very long time because I don't have the patience to use it often.
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