Why only two stars? For this price I expect perfect quality and because you can not afford not Schnitzer as described above! Furthermore, the competition is indeed vehemently prevented to develop suitable substitutes (the love patents). Although I am in a sense of the opinion that the competition after all is good for business. So far I have not let me mislead third-party - there is a sky scared when the reviews read so. So, with my little what I print, I remain comfortable with the original cartridges and pay the inflated price, so my neighbor at Porsche also has a job.