I'm not familiar with this stove. Does it create burning pressurized jets of alcohol when burning. Does it use a pre-heat cup (ie. burn alcohol around the stove first?) What is the performance with other types of alcohol? Everclear (ethanol) is supposed to work quite well but I never see it in our liquor stores so I just go for cheap methyl alcohol (paint thinner available everywhere $2.19/litre) or use gas line antifreeze (methanol not isopropyl). I've never thought about pre-warming the fuel with body heat, the difference it makes is probably minimal except when near or below freezing.

The reason I am asking is that I use a homemade stove with a shallow pre-heat cup (using about 10-15 grams of methyl alcohol) and about 25-30 grams in the stove itself. The jets start off about 150 mm high before I put the pot on and dwindle down to 50 mm after a while. In sheltered conditions above freezing (not dissimilar to your test except lower humidity) it works reasonably well. A jet stove will obviously work better in windy conditions than a simple open flame but I don't have any background on the Vargo. I thought it was way too expensive, especially when I compared it to the $.50 I spent on the pop can homemade stove.

BTW, is that a titanium spork I see in the picture? - same as mine! I use a hard anodized GSI double boiler (got two of these things!) and an aluminum windscreen that only projects up about a 5-6 mm higher than the bottom of the pot but is wrapped very close to the pot. I have a lot of air holes drilled into it to promote good air draw at the top and bottom. I've also used my backpack turned on the side as a secondary windscreen.