for thoses who have a 27" cinema display:
i have issues with the brightness controll, each time i reboot under osx i have to unplug/replug the usb cord to get brightness control working. However if i don't, i still have audio/webcam/light sensor working even if display tab in system preferences don't show the brightness slider...
the audio control gets sometime bugged and freezes, the only solution is to plug/unplug display's power cord.
I've off course installed apple's cinema display update package for the 27"...
Anyone experiencing something similar ?