Review on Valuetoner Compatible Ink Cartridge Set for HP 934 XL and 935 XL - OfficeJet Pro 6812 6815 6830 6230 6835 6820 6220 Printer (2 Black, 1 Cyan, 1 Magenta, 1 Yellow, 5-Pack) by Brandon Wynen

The product was a cheap alternative to more expensive HP inks. Hope it lasts as long. Updated March 29th - I spoke soon. Less than a month after installation and the ink cartridges stopped working. We don't print that much and the cartridges seem to have plenty of ink left. Printed documents looked like they had run out of ink - faded and streaked. Then the color stopped altogether. Black still works and I've cleaned the printheads to no avail. Never had this problem with original HP cartridges. I think you get what you pay for.