I have 3 of those peanut lighters. They are really small, so is the flame. They work fine with warm dry hands, but they are really slippery with sweaty/wet hands, the alluminium outside will make it really cold to handle in the cold and due to it's small size, it's probably very hard to use with numb fingers.

Nice as a gadget, but as a proper survival item, get a proper light.