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Title: Disappointing Cartridge
Review: I maintain and use 5 printers that use the Canon BC-21e cartridge. These cartridges sometimes fail before the replaceable ink tanks are empty to a maximum of 5 tank changes (using genuine Canon BCI-21 ink tanks). The longest life that I have seen is by refilling the tanks before they run out(between 3 and 10 refills).I have been using Canon bubble jets since the BJ10ex and have had few problems apart from the short life of the BC-21e cartridge. I don't know what actually fails in the print heads but they generally fail with the printer unable to detect the cartridge type and refusing to operate until a replacement is fitted.
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