The CPU Energy Saver can not shut the computer down when it is at the At Ease login screen or At Ease panels. It does the countdown but the computer remains powered on. If you are in the Finder or Restricted Finder of At Ease, the computer will shut down.
The Auto Power on/off control panel is able to shut down the computer even when in the At Ease panels.
To determine which energy saving control panels are right for your computer, please see "
Energy Saving Control Panels: Description and Compatibility"