Works very well as a heatsink. I'm removing two stars because it's not meant to be folded or attached to anything. Please note that you use fanless cooling mainly when you use hats and accessories that can be affected by fans such as DAC, DSP/ADC. etc. Unfortunately you cannot attach these hats as there are no lifting holes at the top. It also works amazingly well with the x735 power management hat, but again the hat isn't fixable. Overall the idea is great and it would be 5 stars if the designers drilled (turned) riser holes on the top and used risers on the bottom instead of screws.
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