Well I got 2 rolling boils outside one day on about 0.42 oz.Winds were light., good windscreen. I tried again one night with ~10mph gusty swirling winds, a full tab didnt get it to boil, but alcohol wouldnt have either it was just gusty.
I dont like the soot. I find the whole tab to work better than parts. I tried doing half tab, then adding 1/4s, etc, and it just doesnt heat as fast as when that whole tab roars for 6 min and leaves a little bit leftover.
Tossup to me really, alcohol is easy, CLEAN, less smelly.
One advantage of the esbit is you can automatically simmer by using small 1/4 cubes, easy to just keep adding every 5 min. Doing that I heated for 20 min , but never did get it to rolling boil, just not enough heat input.