This is the best I've tried and I've tried three different brands. I have an older Brother that is no longer made but works great. But branded cartridges are expensive. I count the number of full pages the toner can print; Text documents - no photos, charts, some bold headings and company logo. I bought 4 pcs. I have 3 cassettes in a pack and currently the printed pages range from 1700 to 1830 full sheets of a WORD document each. I couldn't ask for anything better. An average cartridge is advertised as having around 1,300 pages, and not always full pages. I can set the printer to economy mode and it still prints very dark. The toner does not lose its transparency until the end. I highly recommend this toner cartridge and the price is great. terry cloth