1 - They count pages printed and will simply stop printing when they've determined you've printed enough even if you still have toner in your cartridge.
2 - They will not work with third party toner cartridges.
3 - They won't let you refill your own toner cartridge.
So you are forced in to buying Brother's toner, and and forced to do so before you may actually want/need to.
We run third-party toner in all of them, and they'll keep printing until the print quality fades.
I personally haven't tried refilling toner cartridges in a long time, it's not worth it when third-party toner cartridges are as cheap as they are and the Comprenew up the road takes the empty ones back for recycling.
Brother HL-L8260CDW
https://www.amazon.com/gp/aw/review/B06XDS1XW7/R2MQHUVV9JX7N...