A few years ago, I tried a remanufactured toner cartridge for my Brother printer. I was dissatisfied with the quality and functionality of the cartridge. The old saying is true: "you get what you pay for". I prefer to use genuine Brother toner cartridges for my printer. . In addition, Brother is dedicated to being environmentally responsible and offers disposal programs for properly discarding its cartridges. When the cartridge runs out, repackage the cartridge using the box it came in. The box should have a pre-paid shipping label. Secure the label to the box and mail it accordingly.
Have found that the larger size TN450 toner cartridge seems to last at least twice as long as the TN420 and a better value. The aftermarket toners that I have used don't produce the quality or longevity of the real deal Brother product. This vendor does an over the top job of packaging and pricing. A++++