I have bought HF blades twice the first 3 pks I got were great The next 3 packs from the same place seamed to have nickes in about 1/2 of the blades, tryed sharpening them, when I asked the store about them (yes I was nice about asking them) they said they would be happy to refund my money, A gentleman there at the time, another shoper told me the carpet blades were not designed to be used on the better quality fibers only on heavy course rug backing. I don't know if this would be a ansewer to the debate or not. As Joyce said To each his own!! I'm still looking for a less expencive but usable blade, will have to check out the titanium blades