I have two Canon inkjet printers. One for daily use, and one for only top quality printing (neither is professional quality). My plan is to use Linkyo (compatible) ink in the daily printer, and Canon OEM ink in the high quality printer. However, since the compatible ink is one FOURTH the cost of the Canon ink, I was wondering if there was a real difference in the inks ... other than Canon backing the OEM cartridges. Do they use the same ink? Will the compatible cartridges hurt the printer?