Caveat: I use the following printers: Canon Pixma MX 320 and I am referring to the cartridge 510th When I inserted the cartridge into the printer cartridge not recognized this the "double-filled" as "good as new" (full)! I still got the "Low Ink". I ignored this ad and printed funny it happening - it worked, great. However, the error persisted. Then, too early !, the message "Please empty cartridge. Change" came and nothing was more. Sch .... e, I thought - this can not be! The can not yet be empty! And: IT IS ALSO NOT !!! Here among the reviews I found the note, you have the printer "reseten" (press and hold the reset button for 5 seconds - the far right, the one with the red triangle in a circle). I have made. The printer now displays "ink level status can not be determined" and: prints like crazy and in best quality. What I want more. Although Was a "strange birth", but what the heck - rarely stupid technology just :)) If the printout is blurry, you have to stop to change the cartridge. That's it. Trust your eye and not the technology :)) Please look at those interested here: [...] However, Tito Express should better indicate that fact so that misunderstandings in future be avoided. The many negative reviews speak volumes indeed. Therefore, I here only four stars. Quality of the ink is perfectly OK for my purposes. Only the ink level indicator just not working. But I can live with.