OCIA.net has posted a review on the Arctic Cooling CopperLite HSF.

And carefully insert the other side of the clip on the three tabs on the tall side of the cpu base. Since the clip does not work by a "spring action", this may take a little time. After properly positioning the clip, tighten the screw. This retaining clip is really not any more difficult to install than the standard ones with a spring action.

Arctic Cooling CopperLite HSF Review