I have a HP Photosmart 5520. cartridges fit purely good and the level has been directly detected and displayed. Super I thought. Only there was no color. After much tasting and modify settings ('ve done everything what was), a mail exchange with the company was advised by me to do just that, the colors really work only moderately. I have every time before printing the cartridges out and do back in and press firmly, even the first version is still very weak and only the second or even third Printable version so I can use them. But still not to be used for official prints as too weak. The company has offered spare to send, but what I do with it if it's not obvious works- it does not fit my printer that I use no originals. Too Bad !! But again for expensive money to buy cartridges.
