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Originally Posted by Ruiner
Possibly quibbling, but is it feasible that the IHS could serve as a 'heat spreader' when topped with a cheap aluminum retail heatsink? I'd guess the interface between the core and copper/nickel IHS is better than what you'd get from the core through a layer of wax to a grooved, non-flat slab of Al.
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These are exactly the reasons and circumstances under which the use of IHS's were originally justified in technical white papers floating around 6-7 years ago.
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Once you're using either a high end flat-copper based HSF or a good WB, the IHS works as a 'cpu condom'....protects but limits sensitivity. 
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Yes, with the advent of better heatsinks, the original presumptions of shonky aluminium items is nowadays far less relevent. Protection is about the only reason left that is still valid.