The Ingersoll blades Exapta and others sell are significantly sharper when new. I have used two sets now (we replace our disks every year), and they seem good. They claim they stay sharper longer, but I don't know that they are that much sharper after a couple thousand acres. However, they are pretty similar in price (even after shipping from Exapta) to buying OEM from the local dealer, so I will stick with them for now. Otherwise, I would just buy the disks from Needham if I wanted ones similar to OEM.