I too have a Kangar Subtank and I'm running the pre-fitted 0.5ohm coil on my T8 and have to say I'm well impressed! I take a few vapes of this and it's like thick fog in my room and I'm only running it at 20 watts. It's a shame my Provari P3 won't allow atty's with less than 0.7ohm resistance as that is my preferred 'tool' of choice but I'll get to test it when I switch to the included 1.2ohm coil at some point. I'll also play with the rebuildable aspect of it at some point too but in its standard form with a standard pre-installed 0.5ohm coil it's just superb. That's not to mention the huge 6ml tank capacity. The Nautilus was my tank of choice previously but this one definitely pours vapour out like a trooper. 
The one criticism I do have is that the drip-tip supplied on mine is just ever so slightly too loose, ie. there's little resistance when you try to pull it out. This is an issue because I get a small leak if I lay the tank down from where the drip-tip meets the tank. Sadly, the drip-tip is just very very slightly smaller than your average 510 (though my Kanger Aerotank tips fit it just fine). Maybe I was just unlucky but it's no biggie for me as I leave the mod and tank stood upright anyway but it would be nice to know that I'd not come down to leaked juice over my desk if it somehow got knocked over by my cats or something.
The one criticism I do have is that the drip-tip supplied on mine is just ever so slightly too loose, ie. there's little resistance when you try to pull it out. This is an issue because I get a small leak if I lay the tank down from where the drip-tip meets the tank. Sadly, the drip-tip is just very very slightly smaller than your average 510 (though my Kanger Aerotank tips fit it just fine). Maybe I was just unlucky but it's no biggie for me as I leave the mod and tank stood upright anyway but it would be nice to know that I'd not come down to leaked juice over my desk if it somehow got knocked over by my cats or something.