This appears interesting.  I looked at the website and was unable to find the heat capacity of the fluid.  The higher boiling temp may not be helpful if the heat capacity is such that you need a large delta T to transfer the same amount of heat as a water-based system.

One must also consider the effect of the higher operating temperature on engine oils.  At some temperature, oil loses its lubrication ability.  I don’t know what that temp is but assume it is different for different oils.  Just because the coolant allows higher operating temperatures, doesn’t mean one should do that.