I have a Brother 5250DN duplex laser printer that is at least 12 years old and is no longer supported. Brother (no surprise) charges an arm and a leg for toner cartidges, and replacement toner cartridges I have tried from vendors other than InkTonerStore have not done well - 2 to 3 reams of paper when the sites claim 3,500 to 7,000 pages for their cartridges? Really? I ordered (skeptically, I must admit) a non-Brother replacement toner cartidge from InkTonerStore. The order arrived promptly (faster than the stated arrival date) and is now on it's 11th ream of paper with zero problems and is still going strong. Bottom line; InkTonerStore has guaranteed that my ancient, reliable Brother 5250DN will continue giving me several more years of service at a very minimal cost. An aside: Buying 10 replacement cartidges from InTonerStore for the 5250 costs less than buying a new printer that provides the same functionality.