The cartridges are working properly and the print quality is the same as in the original.
Often, by the planned obsolescence printers talk, if not original cartridges are used.
Even if the service life should be reduced, so the purchase was worth it for a set with 20 cartridges. Because the printer was not very expensive, but the ink cartridges from the original manufacturer cost many times.
Should I be right back ink cartridges need for my printer, so it is clear my decision. I'll stay with the 20 cartridges of Logic-Seek!