for our Samsung Printer SCX-4623 we have now bought the third toner cartridge with ink service and are very happy with it. The toner was delivered respectively on the second day after the order and was well packaged. The engagement of the new toner was done in less than one minute and get above all without fingers black. The cartridge fits perfectly in the Samsung printer and is recognized by the printer electronics immediately. I was pleasantly surprised at how long does the toner. Even without counting the printed pages are the in my opinion a very good price / performance ratio