Just got mine in yesterday and have been vaping away for about 7 hours yesterday and 6 hours so far today and the battery is at about 50%. Working like a champ with my Crown tank between 40 to 50 watts on the .25 ohm coil.
Here is a comparison pic with my Kanger Kbox which is a single 18650:
So far I am loving it with just some minor quibbles. The buttons rattle on mine but only if you shake it, they are nice and clicky though. The battery is a little tricky to install but I had already watched Mike Vapes youtube review so knew that was the case and it went in on the 3rd try. Not use to a mod that goes into standby on it's own but just giving it 5 clicks when it does is not a huge deal. I like the threads on the 510 better on the Sig, just feels more solid with less wiggle.
Does anyone know if the TNT 80 has a startup boost or something like that? I only ask as even at 40 watts my Crown with .25 ohms doesn't spit back like it does on the Sig. Seems like the coils heat up fast right from the start with the TNT so the juice doesn't have a chance to spit back. I am really liking that as I am not a high wattage vaper but generally run my Crown with .25 ohm coils at 50 to 60 watts on my Sig to avoid spit back. I have been running the TNT at 40 to 45 watts since yesterday with my Crown and it has been great.
It definitely is a solid mod, weighs 300 grams with battery installed. Even though the Sig 150TC is just a little lighter at 281 grams when batteries are installed it feels more significant in hand. I am guessing because the TNT is more compact that adds to the perceived much more weight. I added the Crown to the Sig to make the total weight about 356 grams and the TNT still seems a little heavier in hand even though it is 56 grams less.
It has only been about 24 hours that I have had it but so far I am loving it. At $41 shipped from vapor world I think it is a steal if you don't need TC. If I didn't already have the Sig 150TC and had to choose I would choose the TNT and pocket the $30 difference. I still love my Sig but if DNA 200 mods come down to a reasonable price I will probably keep the TNT and sell the Sig to replace it with the DNA 200 or something with the Yihi SX350J chip or whatever they make to replace it.