I just got mine, and it is the BEST! Here is what I figured out, in the first hour...
For MTL, use the 1.4 ohm coil pack, and just put the sub-ohm one back in the box. You'll never use it. Prime the coil pack with a couple of drops of juice, and I put one in the center, drip-tip style, just to be sure. Mount the coil, fill it up, and put it all back together. Let it sit for 15 mins, then put it on the unit. I set my Mini at 11 watts, it does about 3.7 volts, and gives the SMOOTHEST vape experience I have ever had. Nice throat hit, excellent flavor, and you won't kill the battery
vaping all day.
I tried using the 0.5 ohm coil pack at 30 watts, and it got pretty hot unless I did DL. MTL stays cool, and I picked up more 1.4 ohm coils online...because I just found the best vape ever.
And yeah, utube has the most info, so try that, too.
The kit comes with the new Guardian ceramic lined coil packs, and tank, which is childproof and all of the stuff that makes it compliant with laws (?), but I just dig it because it is so smooooooth! And it never leaks, which is my main complaint with every other vape device I ever owned.
From what I can tell, any new "mod" device will work with 510 coils, because everyone moved to that thread. You won't want to use just any 510 coil, though, unless you set the wattage correctly and know what you're doing first. Stick with the Guardian, from my research it is the best design for MTL.
Hope that helps!