What size Apple Cinemas are you using? We have both Eizos (ColorEdge 21") and Apples (23") and universally the 23" apple monitors became totally unreliable over time. Initially they were great, but after about a year of use they started to develop vertical color “bands” so that some parts of the screen were pinker, some parts greener. Also, they sometime’s developed a yellowish “shadow” around the edges. Also, the guys in the color department were having to calibrate them on almost a daily basis becasue they could not hold a calibration.
Since many of these were under a year old, I returned them to Apple, and they did some sort of repair that temporarily fixed the problems, but within a couple months, the problems returned. I’ve read in forums that these types of problems are mainly limited to the 23" displays, and that the 20" and 30" behave much more reliably. I tried to get Apple to give me some sort of credit for the 23" monitors (we have 5), but they insisted I just keep sending them in for repair. Well, unless I buy Applecare for each one, that option no longer works after a year.
Anyway, we have switched over to Eizo’s universally for color critical work, and now my page assembly and proofing departments have some extremely fancy 23" monitors. The oldest Eizo we have is 2 years old now and it is consistant and reliable as the day we got it. However, perhaps Apple has fixed its vendor or assembly problems (or whatever it was doing wrong with its 23" monitors) and they are more reliable now. I’m not going to take the chance.