Comparing heating soldering with high current cold heat soldering
From the cold heat website:

We do not recommend the ColdHeat Cordless Soldering Pen for soldering temperature-sensitive or very small electronic components, because the temperature variation of the tip can be dramatic and quick, too quick even for your incredible reflexes. Similarly, it will not work handsomely on large joints that require long, continuous soldering, because it is more of a small-devil sort of creature.