I have tried the knock off brands and now I'm waiting for HP to deliver a new print head due to ink clogging and plugging the print heads. Additionally the ink cartridges although advertised as far more ink "fill" seem to run dry quicker than HP cartridges and the quality of color is less bright.
This is the first ink cartridge that has weight and heft of INK. My husband is writing a book and printed out a few versions on the way and there was still ink. It is a medium length book and he would have been long since out of ink on the old printer which died. Also this is the first HP combination on which I felt I actually saved money.