So far they seem like a great replacement for OEM ink refills. I don't use my printer for professional work, but I print a lot of documents every day (that's why I bought an EcoTank printer) and the print quality seems exactly the same to me. It's too early to tell if I'll be getting the same number of documents from these supplies, but so far it looks like it will. For the price I'm certainly printing cheap enough to make up for not getting the same lifespan or this ink (and so far it seems about the same). I actually think these refills are a bit easier to use than the branded ones that always pop an ink bubble when you take the foil stamp off. They also come with little pouches that you can put an empty bottle in, which is nice.