This was the first model of this cartridge I have used since getting a new printer. The problem is that the toner doesn't always stick to the paper, so the toner gets lost and smears. This happens about every 100 pages. I've had this problem intermittently with other toner cartridges over the decades, and it's always been the cartridge. However, I will purchase another brand for this unit and make sure it is not a printer issue. Updated 5/20/20. Now there are big black and white stripes down the middle of the page. Need to buy a new cartridge asap as the printer is now unusable.