I am using this toner cartridge to replace a manufacturer unit in a Brother MFC-9340CDW. I'm not the type of user that replaces my toner cartridge the second my printer warns me its low (Most printers warn you after a set number of pages, not the actual ink/toner level, you can reset this count on many printers to bleed the cartridge dry, mine in particular has the instructions on the top review on Amazon, if you're interested.), so when I needed toner, I NEEDED toner. I was wary about buying a non-OEM toner, having heard all the horror stories about less than stellar quality standards. After much research into 3rd party toner, I quite accidentally stumbled upon MonoPrice's Ink/Toner section (I have been buying their cables and such for years, but had no idea they sold ink/toner). I bought the toner based on the trust I have in MonoPrice's cables and other equipment I've bought over the years, and I couldn't have been more satisfied. The toner works perfectly, no leaking issues, no page bleeding, only time will tell how long the cartridge lasts in comparison to the original, but that will have to wait for another day. So far so good!