I've been looking at these for a while. They seem to have alot of genuine pluses. I don't own one (yet) but would like to.

They supposedly output alot more heat, making them more useful as a survival candle. Cooking is more viable and apparently they consume a great deal of their waste gas, so it's supposedly better for you. Obviously an objective test would be in order. I guess I'll get around to it eventually but overall they seem pretty solid.