Yeah, the Tornado really is a great car. It is virtually maintenance free, and runs a very long time. The 4WD is great for quick, precise, handling, and great off-road abilities. As Chevy said, the heat sink, is just to keep the motor temperature's down.
I think that they come with brushed motor's because the brushed is more of a beginner version. When the Pro version is for the slightly more experienced driver, because of the speed.
Just to add to the conversation, I noticed the seller's of the Tornado EPX have dropped drastically. When I bought mine, everybody sold them, now it's normal to see Five stores, out of four Google pages sell them.
It is weird how such a good car is seldom sold.