It's main use is to allow women in the third world to spend much less time tending a fire (major cause of health problems) and preparing meals. Most cooking would be beans/grains/veggies, not meat or dairy based. Using it that way would be safer and probably benefit most of us - more veggies, less meat.
That said, my idea of "cooking" is really just melting cheese on top of other stuff. : ) I should get one and give it a shot with some real food.