CONS: I just bought black & color cartridges and my printer can't function with them in. I thought I was shipped the wrong thing until I read the package only to see it was what it was supposed to be. My printer ribbon thing can't move back and forth with it. I am open to the idea that I installed it wrong, but without any instructions I have nothing to compare it with. So frustrated!
I have bought ink from Monoprice for a little over a year now. The first black ink cartridges that I bought were item 7345, and they worked great! They have been discontinued, though, so I started buying these cartridges, item 8907. These newer cartridges have been of varying quality since my first order of them. Some of them work great with no problems. Others print with lines or streaks from their very first print job. The most recent issue I have faced is that the printer will sometimes spontaneously have an error, saying that the cartridge has failed or is incompatible with the printer—an odd thing for it to say when I printed a document earlier in the day with the very same ink cartridges installed. In fact, the past 3 of 5 black cartridges 8907 that I bought from Monoprice have had this issue, and it feels like a waste to have to throw one out simply because I can't get the printer to realize that it has, in fact, printed with these cartridges before. Cleaning and reinstalling the cartridges has not solved the problem, and I have not used the cartridges enough yet for them to be low on ink.
To summarize: when they work, they usually work very well with only a few exceptions. However, when the cartridge decides to quit or the printer decides that it can't recognize the cartridge, though, you have the potential of losing half a cartridge or more. What a shame!
CONS: Inconsistent sometimes treated as incompatible cartridges by the printer.