It HAS been finicky - we have used generic toner and Drum replacement, and it was not printing well. I restored 'old' brand name drums and now it seems fine - SO IT COMES WITH 2 SETS OF DRUMS for '12,000 page Life' each.
Also extra 'old' generic toner cartridges.
We just bought an Epson EcoTank, so OF COURSE this Brother should now be perfect!