I just got these myself and all I can say is WOW!! I've been using the standard 510 and the megs batts since October. I just bought a multi pack from TW as well as the multi pack of mains (for charging). I already owned the 5 port multi charger. I vape VERY HEAVY and I have yet to have a battery die on me. I usually put it on the charger around the 7 hour mark but I have yet to drain it to the "flashing point"
I just got some LR attys for it and it made it even better. These things are the awesome. The regular attys work great as well, but the LR attys are unreal. I would recommend to any 510 fan who does not want a "mod"...I would love to see the TW logo on the front light up but I'll live. I'd give this a 10/10 also.....solid vapor production, solid taste (more so with the LR atty), superb battery life, solid construction....
oh and the "Cone" is a must is you like a little resistance in your drag. I find it also helps in the throat hit and vapor production as well. They say its just to cover the threads on the battery, but it also acts as a cover for the atty. ie: covering the little attys holes just enough to cause sucking resistance......cant say enough about this...I love it