Well the coolant actually resists heat, so if you run straight coolant the thing may over heat. As the coolant passes by the cylinders in their water jackets, the coolant is supposed to pick up the heat from the combustion process, but coolant resists heat, it's the water that actually removes most of the heat.
I have heard of Evans; there is a nice video on them in Jay Jeno's Garage on youtube...seems like legit stuff.
Personally I'd just use a quality coolant with distilled water...you shouldn't have issues with that if you change it regularly.