I received my Kanger 120 TC yesterday and have been messing with it a lot. It seems to be solidly built, and uses 2 18650 batteries in series, I believe they are in series because one battery goes +up the other goes +down. The battery door fits really well, and is a little difficult to get off the first time. It has 4 TC modes besides wattage mode, Ti, Ni, NiCr, and SUS, SUS is the Chinese way of saying SS. I have only tried Ti, and SS 316L coils so far, the Ti coils will make it pulse very noticeable, the 316 coils don't seem to pulse at all, except you can see the watts change in the display. Another thing is the TCR curve for the SUS mode seems to be for SS 304, when I set the TC for SUS I have to set it about 50 degrees lower than what I want it to be. Right now I set it between 350f and 390f depending on the juice I'm using, which means its running from 400f to 450f going by Steam engine calculations. The firmware is upgradeable so maybe in the future they will have a upgrade changing it to a 316L curve. In the end I have to say its a well built mod, but a little bigger than I prefer, its only 1mm thicker than the Kbox mini, but 2mm taller and 17mm wider. It will make a good at home mod.
Its probably the same as the Kbox 200w TC mod, but I decided on the 120 because I don't need 120 watts much less 200 watts, besides they didn't have the 200 in stock, and its about $10.00 more.