I don't know whether it gets hot, but it looks to me as if the internal armature dissapates the energy through motion rather than heat. The non-reactive loads like the Scholtz Power Soak do it via a resistance network, and the resistance network gets really hot. The Mass and the Marshall Power Brake use motion, the Mass through a disconnected voice coil and armature and the Power Brake through a motor. While there is some secondary heat from fricton, I wouldn't think there would be much.
Why don't you write them an email and ask? I'd love to see the results.
Bob
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