This subject has been discussed pretty extensively in the past couple of weeks.
In summary, tin can "wood gas" stoves are really poor examples of biomass gassifiers. A true biomass gassifer produces a clean blue flame. In WWII biomass gassifiers were put in the trunks of cars to save gas and diesel for the war effort, and some people even today still choose to run their cars on wood.
Dan Yeruski has done some comparisons between tin can, double wall, "wood gas" stoves and single wall top lit up draft (TLUD) wood stoves and found there's no improvement with the double wall arrangement. I haven't done any comparisons myself, but I would agree with his observations, since most of the stoves on youtube claiming to be "wood gas" stoves are really, really, poorly built and perform very poorly. They might burn a little cleaner than a normal hobo stove, producing slightly less smoke.
To have a good clean burning wood gas stove, there needs to be proper fuel selection, preparation, loading, etc..., and a really well designed stove for there to be any benefit. And in the end, a true wood gas burner is far more finicky and complicated to use than a normal wood fire or TLUD burner.
For me, playing with the idea of a small burner that produces a clean blue flame is a fun hobby, but as a backpacking stove- get a back-country boiler, trail designs tri-ti (ti-tri? I can't ever remember) or one of those collapsible box deals. I may eventually bring my wood gas stove to play with on the trail, but I wouldn't leave my alky setup at home.