Why would they tell you the use of a remanufactured cartridge would void your warranty if it isn't true?  The choice is yours - You can give them the benefit of the doubt and believe they are just misinformed or you can believe (what is more likely the case), that they are saying the words they know will convince you to spend 2 - 4 times more money than you have to on a brand-new, name-brand toner cartridge on which they make considerably more commission or profit! Please Note:  We have been in the remanufacturing business for over sixteen years and know for a fact there have been remanufacturers who have turned out crummy products (either intentionally by using cheap or inferior components or by choosing not to replace critical internal components on every cycle) and that may be the reason some retailers choose to recommend against the use of remanufactured cartridges. On the other hand, we know from our own experience that when a remanufacturer does the job right (and there are plenty of them out there who do) and their cartridge is properly remanufactured with all the best components, there is no reason in the world that remanufactured cartridge won't meet or even exceed the performance of the name-brand, brand-new cartridge. Please note: If you are one of the people who has had less than OEM performance out of a remanufactured cartridge, give one of our W&Z kits a try and see for yourself how a perfect refill can be accomplished in so little time for so little money!