I have been using Jettec remanufactured ink cartridges for years - first for my old Epsom printer, and for the past two years for my HP Photosmart. I've never had a problem with them. Unfortunately there seems to be no way to reset the chip on HP cartridges so the ink level monitor won't work with remanufactured cartridges (I had a chip-resetter for the Epsom cartridges which worked perfectly!)
I bought these after reading good reviews of the product and I naively thought that as they were not exactly cheap, then they were probably a good choice. How wrong I was. This was my first and last experience of buying compatible printer ink cartridges. I've just ordered the genuine HP ink to replace these after only printing four pages.