I was very skeptic of using a knock-off product, but its low price and the criminal prices of genuine canon cartridges made me take the plunge. Extremely happy I did so. No only the build quality of the cartridges is excellent, but there is absolutely no visible difference in the print quality. Moreover, I have a vague suspicion that these cartridges actually hold more ink than the ones I used to buy from Canon. Once caveat: sometimes the printer does not discern the correct amount of ink left in the cartridge. I have kept on using the cartridges for dozens of pages after the printer said that my ink levels were very low. This very minor inconvenience is well worth the tons of money you save by using this product.