We tested this device ourselves by dropping around 300kg of weight and it was reliable in stopping such falls. We also tested it on progressively thinner ropes to see if it would damage it; A hollow propylene braid only 6mm thick worked perfectly with this device. Repeated use wears the rope down because it "bites" into the rope with metal, but you should still replace the rope after a few falls. The only odd design flaw is that the device rubs off its own paint on the inside; I don't think it matters because it shouldn't rust.
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