It is also very difficult to machine, and it requires heat treatment after machining. Power electronics and motors can easily be damaged by heat. It is a good idea to mount these items on a material that will conduct that heat away quickly, and keep your expensive components cooler. The best material for your heat sink is pure silver. If you can't afford that, aluminum and magnesium work very well.
Copper is about twice as effective as aluminum, but it is also very heavy.
In BioHazard, the Vantec electronic speed controller is bolted directly to a magnesium body panel. I made sure to use the side of the Vantec that all the transistors are on as the mounting surface. This is a pain because of all the little screw heads on that side. I drilled a little clearance hole in the body panel for each of the 48 screw heads. I also give it a thin coat of heat-sink compound to increase the rate of heat transfer.