I would just like to let anybody know who might be a little apprehensive about giving TC a go that I personally find the Sigelei a magnificent mod. As posted before I am a techno turd and find some menus too confusing. I enjoy using something simple and straightforward. I know I'm an idiot but I may as well admit it! This device is simple enough even for me to get my brain around and I have been using it now in TC mode for a couple of weeks with no problems or head scratching. I was about ready to forget about TC as it was all to hard and appeared to me to be of little reward for my efforts but this device changed that and I now enjoy it. I've been using it with the subtank mini with nickel coils and the combination has been performing flawlessly. It's only single 18650 but I'm getting a working day out of a charge which is fine by me. Size wise it's just about perfect in my opinion too. I do enjoy the capability of being able to almost drain the tank and change the juice with very little ghosting of flavour. I won't embarrass myself by attempting any kind of review on it as that would be a disaster and there's enough on line from people who know what they're talking about anyway. This is just my honest opinion from an average vaper who was hesitant to join the TC bandwagon but is glad he did.