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I've been using the Kombuis rocket stove by Arnaud, which is a small company that got starter through kickstarter and it's great for what it is.
Obviously, if I'm going to trek through the fucking desert or climb mountains I'd go with something else. But for what I use it for, which is mainly deep-woods camping/trekking - I can't complain.
So long as you got some twigs laying around, and a reasonably flat surface to put it on, it's good to go.