I have the cartridge in the IP 4850 in use. They are very accurately, the level indicator on the chip is working properly, the photo printout of a test image (c't Lady) is crisp and color very natural and balanced. About long-term color behavior I can not say anything, because of the other criteria and the price of just 1 / cartridge (Feb 2013) but they are an absolute buy recommendation. Obviously, the price developed precisely upwards slightly, but that's quite ok, as long as the quality remains.
