the smok m80 TC was a bust - for regular wattage mode, it is a great little box and I use mine regularly, but for TC, 'the cake is a lie'...
now, the x cube II - that is a whole different beast - have one in hand right now and love it, though i have been slacking on trying the TC - partially, because i have not done my homework/ reading on setting up the TC (have ni200 coils for my freemax starre pro tank that is sitting on it right now...) and partially because i have up to my heinie in alligators, metaphorically, with work - its on my list of stuff to do this week, lol
thus far, i can say,without reservation, that i WOULD happily recommend the x cube II (well built, love the firing bar, memory mode rocks) - but can't give any good feedback on the TC mode yet