TC users, ignore this or maybe inform me about what the issues people have been having with this device are. VW Kanthal, Clapton, some SS coils, or other NON-TC coils such as those on a TFV4 or TFV8 just for example. TFV4 TF-T8 Octuplet .16ohm Clapton coil that runs up to approx.130W is best with this coil so far. The adjustable ramp up time is more useful to me than it is to most people. I actually raise it a little when using such high wattages but keep it as low as possible to quickly fire off targeted wattage levels like a TFV4 94W vaping of TF-T3 .2ohm (cooier and tastier cloud chaser coil, which is the first coil ever for TFV4 tanks around a year ago or even longer), TF-S6 .4 Octuplet coils at 88W, TF-Q4 new quadruple coils at 100W give or take. Getting 130W of high powered vapor blasting in your lungs isn't as good as it is with just the smallest increase in delay. Cool and smooth vapor coils under 100W is awesome with the lowest ramp up setting, oh hell yes. So that's the ramp up, or TCR, I think but am unsure, feature which is Sigelei 213 Fuchai's premier new exclusive feature. Menu isn't the easiest to navigate but it's minimalist appearance and form are refreshing in my opinion. Best purchase I've made for quick punch vaping and I've been waiting for some device to make vaping as fun as it was when I first started.