If you have an old (>2ish years) non Internet connected printer, you're probably fine, but they pushed a firmware update last year that disabled third party cartridges. Luckily, for now you can just pull the drm chip from an official cartridge and put it in the third party one.
TN43x cartridges don't have the DRM chip, thankfully. They still sell printers that use them. Such printers cost a bit more than Brother's base models but to me, it was worth the extra.
