I've got some lovely prints from my IP4600, but boy does it drink ink! Five or six A4 prints, a couple of smaller bits n bobs and it was empty. Can't find genuine inks anywhere on the high street for decent money (its around £35 - £45 for the set of genuine inks) they're a lot cheaper online mind.
When I get round to it I'll get some new cartridges and see how it goes again, I looked into the continuous ink systems, bit pricey to start with but they're obviously a lot cheaper in the long run, provided you get the same quality.