I purchased a brother MFC-9125, 7 or 8 years ago for my start-up business. Went through a lot of toner because I was printing flyers and brochures. The business didn't pan out so I've been using the printer just for home use for most of tis time, and the toner cartridges last forever. However due to the age of the machine and the amount I used it, I did have to replace all 4 drums about a year ago. (cant remember the cost). Other than that there have been no other costs to run or maintain this unit.