Anyone have any information on how that works or how well it works?

I don't know anything specific about above heatpipe, but heatpipes in general consist of three components: container, working fluid inside the container and a capillary structure. Different materials are used for different applications. It's a thermodynamic cycle that involves the liquid entering a vapor state at the input end and condensing at the output end. Here is an animation. It works pretty well with a thermal conductivity many thousands of times that of copper.