Having had a lot more time to use this stove in the UK and in Finland. I am happy to report that it has performed very well. Its far more durable than its weight would suggest.
The heat output is pretty good keeping us pretty warm below freezing in a small tipi. Whilst it is impossible to full dampen down the fire box completely as it is a folding stove it will never be airtight once a good bed of coals is created the stove keeps producing heat for several hours.