Careful with off-brand toner. The toner particles are often jagged rather than smooth, which can damage the fuser roller, requiring replacement. This happened to me after a few years of using off-brand toner. I was able to perform the repair myself, and granted the cost wasn't as much as buying on-brand toner, but it was challenging (lots of delicate parts) and I don't wish to repeat the experience.
The bigger problem I've seen w/ off-brand toner are refilled cartridges that are poorly plugged and end up leaking toner all over the inside of the printer. Toner is a nightmare to clean up, and once you get toner deep into the nooks and crannies of a printer you'll never get clean paper output again.
