TEINO toner is one of the worst cartridges I have ever used, claims 2300 pages, in reality: 400 pages! After 350 pages, the printouts become illegible, and increasing the level only makes the situation worse. The Canon ImageClass MF743 CDW is very picky, you'd better pay more and get a chipped cartridge even if you ignore the low toner warnings. My printer stopped, I was lucky that I had a new original cartridge on hand to continue printing. There's a reason they're offering an extra 15%…