These cartridges are great. They save me a huge amount of money$$$$. The ink as far as I can tell is the same exact quality as the original HP's. I use the ink to print on Ink Jet Printable disc in my HP c309a with no problems. Have also printed pictures, business cards, and regular documents all with no runs, drips, etc. The only downfall to using these cartridges is that you loose the printers ink level meter. For the amount that I save on ink.....I CAN LIVE WITH THAT! I normally run my cartridges past the low ink reminder anyway. Thanks SMS!