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Good quality toner that works reliably. It's more expensive than the generic toner cartridges, but it's worth it since these don't leak, streak, or otherwise fail in use. Keep in mind that the claimed 3,000 page life is based on a 5% print density per page. That's not a lot of print on the page, so it's not uncommon to get less than 3,000 pages before this runs out. But the 5% standard is what most toner manufacturers use to come up with a page count, so Brother is not unique in claiming a higher page count than you would get in normal use (I imagine not many people only cover 5% of the page with print). To help extend the life of the toner, use the toner save mode on the printer. Plus, change the setting so that the printer does NOT stop working when the toner is low. You can often get quite a few usable pages out of the printer with a low toner level. Instructions on how to change those settings vary based on the printer model, so check the manual online at the Brother site if you're not sure how to do it. Easy to install, and has a long shelf life (provided you keep it at room temp and sealed in a box) so you can keep one on hand for when it's needed.