
I spent over $100 on "real" toner for my very expensive Canon printer because I was concerned that regular cartridges would void my printer warranty. Anyway, my printer is no longer under warranty and when a few months ago one of my original $110 cartridges failed after a few months and only a few 100 copies were made, a Canon rep told me that the warranty on their Cartridges is only 30 days. . So I decided I had nothing to lose and gave these cartridges a try. So far they work just as well as the OEM cartridges. at a great price! I don't know how long they will last, but I'll be happy to double check them at the end of their lifespan. It's so good at the moment and I would definitely recommend and buy it again