Pros: Best deal around. Received extra cartridge with purchase of Canon 6670dn.
Cons: No problems.
Overall Review: Have not used this cartridge yet. Still using cartridge that came with printer and I don't expect any problems with this when I use it.
Pros: Worked great. If price was right I would buy again. Have been using refurb'd units without a problem ad a lot cheaper.
Cons: Price