Have used them for years. Reliable - work - using 3 - 5 wicks they are quite a little heater and a sooty, but useful, stove! I was in a tent at +10 F nr Lake Mississaugua a few years back and a Nuwick (or something like it - now long gone) with 5 wicks made a real difference in a smallish tent with two people in what would have been very cold and unpleasant conditions. The Northern Lights were terrific that week, though.