I was leery of buying a knockoff, but I decided to try it - after all the price is definitely better than the name brands. When I got them, I was amazed at how razor sharp they are. I needed almost no pressure at all to cut through several layers of fabric, fleece, and stabilizer. I make bags and wallets, so I need to cut through lots of different material - these blades are wonderful for that! The only thing I have noticed is that they don't STAY sharp as long as the name brand. In fact, the name brand seems to slowly go dull, while these work perfectly and then suddenly will go dull. That is okay though, for the cost savings, I am still getting many more cuts per dollar with these, and they are sharper out of the box than name brand. So I will continue to buy these.