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I camped with a guy who used one. It's nice and all, but my guinness can was better (faster on the same amount of fuel, lighter) except if I stand on it, it'll probably break. Then I'd make a new one for free though..
I tried a lot of different designs: pseudo pressure stoves, penny stoves, inverted types, spiral types. All were more effort than they were worth and required stands. This is by far the best design i've come across:
https://vimeo.com/64726512
Although I didn't try any of this guys (amazing) ones:
https://www.youtube.com/watch?v=WkW-fhQAZjE
Anyone use the White Box Stove? Any good?
Description is trying a bit too hard sell
http://pages.ebay.com/link/?nav=item.view&id=221147751428&alt=web