My experience with remanufactured cartridges happened 5 years ago or so, and maybe the inks have gotten better, maybe not. Anyway, I had a Canon BJC-600 (really nice printer for its time), and the cartridges were $40 for all four colors. I decided to try remanufactured inks, which I bought at a local computer store. When the yellow ink ran out, I refilled it, make sure there was no leakage, and tried to use it. The yellow ink doesn't work anymore. I've decided that paying the extra money for a genuine cartridge is worth it - at least then I can blame the company if the printer fails.
-David