I gather some (definitely some HP ones) have date chips in them, and wonder if the recycled ones aren't reset? I recently bought a new HP 111 roll feed printer, and thought I'd best get a spare set of cartridges in stock (genuine, as its under warranty, I know what HP are like for trying to wriggle out). £101+vat! Aaaargh! I use genuine ones in my Canon ip4500, as I use it for photos, but as soon as the big HP one is out of warranty, its going onto cheapos, I do not care about the accuracy of its colour rendition, and most of the time its doing black only, anyway.