Last 12A cartridge leaked toner. Not good. Didn't last very long, either, though that's just more perception than anything else. If there was a God, He'd introduce the concept of competition into the toner cartridge business... best way to reduce the high costs, without resorting to "remanufactured" cartridges.Of course, HP simply will respond as it currently does by introducing a new cartridge design with every different printer it makes, an infuriating practice. Pretty soon the "wall" of different HP cartridges available at your friendly neighborhood computer/office store will grow to rival the Great Wall of China in dimensions.