Purchased a full set, and replaced all three colour cartridges at the same time 5 months ago. Everything looked great initially. Today, I noticed some minor smears of cyan on my printouts. (They're still legible, but I wouldn't feel right using this professionally). I then went to look at the printer's web-based interface, and it claims that - I've printed 64 colour pages since changing the cartridges - Cyan and Magenta are showing 95% remaining, Yellow is showing 0% remaining (!) As far as I can recall, we have not used any significant colour in our printouts since replacing the cartridges (no photos). Given that the cartridge claims it should be good for approximately 1000 pages, that's... disappointing.