In reply to jezb1:
I have the "wild woodgas" stove, which is v similar.
I see it as a fun toy rather than a serious backpacking stove. I quite like using it and will chuck it in the back of the car when I'm going somewhere but there are issues that prevent me from relying on it.
The fundamental problem is that you need to be able to find dry fuel, and liquid fuel or gas is light enough that you need to be out for quite a while before the saving outweighs the faff.
The other issue is that you will get resin all over your pans. Not an issue if you usually use camp fires and like your pots black but it is a bit of a pain if you use small pans that you put inside your bag.
Finally, guaranteed supplies of dry fuel in the UK is a bit of an ask. Dead heather is the best bet I have found but you get tons of resin coming off that.
Having said all that I do have a couple of long trips in mind where I'm seriously considering it. Maybe with a lightweight gas stove and small canister as backup though.