These 2007 Dell ISP LCD monitors calibrate nice in Mac OS 10.4 Tiger and 10.5 Leopard. However, Mac OS 10.6 Snow Leopard disables your ability to use the OS's System Preferences to calibrate these older, non-Apple, third party displays.
I really like the dual display set up. One small thing I like about moving away from CRT displays, over to the LCD environment, is that I don't hear the Cathode Ray Electron Gun "kick-start" when ever I wake the computer up. I'm glad these 2007 Dell ISP LCDs have come down to an affordable price range. I'm glad to move away from CRTs after using them in my business for over 10 years.