Copper Isn't Always Good: VANTEC CCK-6035D
The CCK-6035D is based on a relatively thin plate of solid copper to which some 30 copper fins have been soldered. The fins themselves are only a few tenths of a millimeter thick. This results in a large heat sink surface, compared to a cooler with only a few wide cooling fins. This is to significantly increase heat dissipation. The case of the fan is made from corrugated aluminum.
Smooth but not perfect: the underside of the CCK-6035D
As you can see from the diagram, the cooling performance is rather inadequate compared to copper coolers by other manufacturers.
The CCK-6035D even had to abandon the field to the two tested aluminum models, the FCE-6030D and the FCE-62540D. This doesn't change the fact that the CCK-6035D is a good all-around cooler that will even handle the dissipated heat of today's CPUs.