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.
At work, we have an MFC-8950DW laser printer and it's not very good. It leaves streaks on the paper and the toner doesn't seem to fix properly all the time. I end up with printed pages that smear or the type rubs off. That printer replaced a much older Brother laser and it was better. We "upgraded" simply because drivers were not available for 64-bit Windows.
Brother HL-L8260CDW
https://www.amazon.com/gp/aw/review/B06XDS1XW7/R2MQHUVV9JX7N...
#1 is a simple setting in admin console of the printer -- at least for my model.
It is called "replace toner" = "continue".
Default setting is "replace toner" = "stop printing".
I print for MONTHS at a time after the printer displays "replace toner" message with perfectly dark prints. Even when the print starts to fade out -- this setting ensures the printer wont refuse to print. Just keeps showing the low toner warning.
#2
I have not come across this restriction myself. Happily using cheap third party toners bought off Amazon for about 6 years now.
#3
Did not try but my guess is that should work too. I was just not motivated enough to try because cheap $10 toners on Amazon do the job for me.
Because I'll chime in with everyone else -- my HL-2270DW has been going strong for a decade and I've only ever used third party replacement cartridges. And it'll give me a "toner low" warning but still keeps printing.
The starter cartridges even come from the factory with a fill port covered by a removable plug.
The above applies to Brother printers that use TN43x series cartridges. Cheaper models have the reset chip dance.
There's also a fill port right on this printer's starter cartridges. Brother even provided a removable and reusable fill plug.