More MacExpo Items: Thermapak

This is pretty darn cool (literally) and I want one.  It works by utilizing a solid substance that “turns into a liquid” as it cools, and even while in a liquid state, the Thermapak will continue to cool the unit, and when the computer is not being used, the substance turns solid again.

I'm curious about the length of time that it can be used in one sitting, and I wonder how good a conductor it is once totally liquid - how does it keep cooling the laptop if the phase change is complete? I could read about it, but I'm too lazy so I'll just link to their "about" page.

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EDIT:
I have to say, I'm pretty skeptical about this paragraph:

When a laptop cooler featuring HeatShift Technology™ is placed under any notebook computer, the crystals inside are in a solid state. As the underside of the laptop begins to warm up, this heat is transferred to the HeatShift Technology™ device. This transferral of heat gradually changes the PCM crystals into a liquid. ThermaPAK's pad grooves channel air under the laptop, and use the second law of thermodynamics (which states that heat will tend to flow from hot areas to cold ones to reach equilibrium) to draw heat from the laptop. Our lab results, as well as those of independent reviewers, have seen temperature decreases of up to 6°C (11°F). After the laptop begins to cool, the HeatShift Technology™ device changes back to a solid crystal - ready for the next use.

Wait, what? don't go quoting the second law of thermodynamics on us in the context of "the pad's grooves channel air under the laptop, and use the second law to draw heat from the laptop... independent lab tests have seen a temperature decrease of up to SIX DEGREES CELCIUS." Lame. If I'm going to spend $30 on a laptop cooler I want more than six degrees of separation of cooling power. If I want a nifty little pad to keep my lap cool while typing my next blogpost, then fine.