Just from my experience, the black refils will work ok. They usually take a little longer to dry, and may smudge. I have never had any luck with color inkjet refils. The colors are not true, and sometimes even print lines in your photos. I would not deliver reports printed from the refil that I purchased. Hope this helps
I have had similar problems to what Mike Sooner noted. The last batch of knock offs I ordered didn't seem to be re-filled well, sure'nuff... they didn't last very long at all. Iv'e gone back to the brand name carts. They aren't real expensive for my little Canon anyway, that's the biggest reason I bought the printer to begin with.