You cannot tell any difference in function between this toner and the OEM toner. We use this in an older printer-copier and the toner fits the unit perfectly. The toner lasts a long time and gives us high quality print outs every time. I have not had a problem loading the cartridge in the printer. The toner must be high quality as there are no smudges or bare spots on the printed page. You will be happy with the consistent results obtained with this toner.