Thanks for the suggestions - I had read about using 521s but they would cost a lot more than the 14 to buy this set of cartridges which are designed to be refilled. They look like they can be refilled without even taking them out of the printer which would be a bonus. Changing the chips is not a problem for me either. I also like that they come empty so I can fill them with my choice of ink. They look like the filling holes allow them to be filled in the same way as the German method but from the top instead. I would like to hear from people who have used these or similar types and how they got on with them.