If you want the easiest to use, completely integrated monitor calibration solution, these are the models you want. These models feature a full monitor calibration system with the sensor built in to the monitor's bezel.
You simply set up calibration once, schedule it, and then forget about it! The calibrator comes out of the bezel at the appointed time and the monitor performs fully automatic calibration (even to multiple targets if defined). The computer doesn't even need to be turned on. I run mine on Sunday nights at 1am.
Put simply, there's no better system.