content: Worked perfectly from the start. Simple. Clean. No hassle. Pay close attention to instructions regarding using pump to stimulate ink flow, and avoid refilling a cartridge which has been empty for some time (it has dried up and may not refill properly). Also, as another reviewer mentioned, the calibration marks on the ink tank serve as an excellent guide to monitor how much ink has gone into the cartridge.Construction quality is very precise... much better than I would have expected for a product of this nature. This product will save HUGE dollars over feeding HP their profit gouging prices for OEM. Hooray!