I have had a lot of trouble with HP920 compatible cartridges. At the moment I have 8 on my desk some full some half full but they will not work. The light on the printer says they are empty. Some times if I fiddle with them I can get them working but it's some thing I don't want to do when I'm in a rush and end up with ink all over my hands. I have no trouble with the order and delivery and the genuine cartridges. I have purchased other cartridges for my printer a lot cheaper than the ones you supply and have had no trouble although they look the same, The ink colour may be slightly week but they do keep on working.