One must note a few things. First, one must the printer with these cartridges can not be standing around longer than 2 weeks unused, otherwise the print head dries up and it requires repeated intensive cleaning, what a set of cartridges nearly empty. For others, you should at a time with these cartridges do not print more than 50 pages, otherwise the print head could run hot. Just wait for 50 pages a few minutes. And thirdly we must not change the cartridge immediately, if the printer is indicating that they are empty. With a supposedly "empty" cartridge can print still loose 30 pages, because the sponge is then sucked to the brim.
Taking into these three simple instructions, you can with these cartridges for the 1 piece of wonderful print, the color looks good and does not fade more than the original color. And for a savings of 15-18 PRO CARTRIDGE, for a total savings of 300-360 euros in the whole carton I take these little quirks like to purchase!
Oh, I have a Pixma MP640.
Edited: Unfortunately, I have to change my negative review. The first box, which I bought in February 2012 was as described above. Now I have some time little printed and only now begun the second box from March 2013, and eingesaut me promptly the printer completely. So much so that I have after hours of cleaning still black spots at the corners of prints and the source can not be found. I have tried 3 of the wide black cartridges and each time the same game that just did not sit well and get out! The cartridges have now also have a different shape than that in the first carton.
Conclusion: The first delivery was great, the second the total flop. Do I have to do well wiedermal on the dangerous search for cheap cartridges and hope that the printhead survived the tests ...