This is the umpteenth time I've tried a "Brand X" toner or ink product, and every single one of them over twenty years has been a disappointment. I returned the last one I bought from Monoprice (for a different printer) and will probably have to return this one.
PROS: It's inexpensive. It arrived very quickly, and it's well-packaged.
CONS: It leaks. All the pages receive a very light dusting of toner from top to bottom on both sides. I've vacuumed it up a few times, and I'm still trying to figure out where it's coming from to see if I can fix it.
I've always used ONLY Genuine OEM toners due to past bad experiences, but after using about 5 of these cartridges I'm converted. I have had no problems whatsoever with toner leakage or print quality, or anything else for that matter.
PROS: Yield and quality is comparable if not identical to the original Brother cartridges- for ~40% less money.