I disppeared into mech land a few months ago when I got a couple of Stingray X's but Im thinking about picking up one of these two sigelei's since theyre so cheap. I have two of the 30W Sig Minis that have been awesome, but since Im running it towards its max wattage, Id like to get one thats a little more powerful so Ive got some headroom and not running the chip at full blast all the time.. I can get the 50W V2 for $30, but then noticed the 75W TC model is only $5 more. Either one would work, and I have no plans on using the TC feature (way too much Kanthal in my vape box to bother with it), but Im curious as to the differences between the two as far as the chipset/software, and the quality/response of the buttons, 510 threads and pin. I have one of the first run of Mini's that the threads stripped out on after like 2 months of use (my kayfun 4 literally popped off it while I was driving one day), but the newer one I have is still perfectly fine. Im hoping I wont run into this problem with the higher wattage models. The buttons on the 30W arent bad but feel kinda cheapish and Ive already read about peoples crapping out on them. The chrome coating on both of mine is pretty worn off now as well, after less than a year of use. As far as the chipset, anybody know whats in the 75w?? The 50W has the Yihi SX330, and so far the Yihi stuff has been pretty top notch, but I see no mention of what is inside the 75W model..