Review on Smart Ink Compatible Ink Cartridge Replacement for HP 902XL 902 XL (2 Black, Combo Pack) – Compatible with OfficeJet Pro 6978 6968 6970 6975 6960 Officejet 6962 6958 6950 6954 6951 6956 6961 6963 6964 6966 by Justin Herman

I decided to try this as they claim they can show ink level indicators. Not only did he not, the cartridges didn't work at all and had to be returned - after wasting an hour of fumbling and wasting paper to get them to work. There's a lot of caveats in the box: you still need to make sure updates are turned off on your printer and only use cartridges from that brand, and we're crossing our fingers! I just went back to my original brand and the cartridge worked straight away.