I’ve had it for 8 years now, and so far it’s only on its second set of toners etc.
The only warning I give to brother printer owners is don’t leave them on. The capacitors in them aren’t the best and your printer will either not turn on without a long power off, or like mine it will turn on and off randomly all day and night.
So now I only turn it on at the wall when I need it, and unplug it after