Awesome design, works really well. The fact that you can hold the side of the jug with the burner going full-billy on the bottom is testament to the efficiency of the system.
One word of warning – boiling water you can’t go wrong. If you have anything heavier than that in it (soup, porridge, stew etc) you can very easily put heat into it faster than can be moved away from the heat transfer surface on the bottom, irrespective of how frequently/religiously you stir it… I have a nice singed look to the base of mine now; still works fine though!