I just recently got a new Canon Pixma iP4700 printer to replace a Pixma iP5200 which died due to an electronic failure. Canon has always made a very good printer, but their inks are so expensive! I began refilling the CLI-8 original cartridges on the iP5200 using Hobbicolors UW8 inks http://cgi.ebay.com/Hobbicolors-Med...1QQcmdZViewItemQQssPageNameZRSS:B:SRCH:US:102 I used the procedure of drilling a small hole in the back of the cartridge at the bottom, then filling with a needle and syringe, allowing the sponge to saturate. This works perfectly, not one drop of ink leaks! No need to seal the hole. I used a 1/16" drill. Now that I have the new Pixma iP4700, I have a question about the ink formulation.:/ Is there any difference between the ink used in the cartridges of the CLI-8 series and the CLI-220 series? The Hobbicolors inks I bought from eBay were for the CLI-8 cartridges, and I still have a lot left. I don't want to throw it away if it will work with the newer CLI-221 cartridges. If the inks I'm using aren't a good choice, what would you recommend? I have been looking, and I have seen inks by Sudhaus, but cannot locate their webpage or their product page. Are these high-quality inks like Canon original ink? I do not want low grade "compatible" cheap inks that will destroy the printer or damage the printhead. I would very much appreciate your thoughts and advice!