First take: got the kit last night. Charged one up 8 hours and did the 20 minute vape then re-charge process. OMG...WOW! These hit better than several of my real expensive mods, they are beautifully constructed, ( I have the Titanium ) and strangely they seem balanced in my hand like they were engineered that way. My 1000mah joye egos don't feel as balanced. It's hard to explain. They are lighter than the joyes. I'm using my Boge 2.0 cartos right now, but tried the Echo-E and Std. 510 and my XL dualies and the Emdcc. Perfect vape from all of them. I couldn't be more pleased. I just wonder why these are not more popular than the Joyes. They are bounds better...and there is really no reason that I can tell why they would be better than say my VV Box at the same voltage or my Tube mod at 6V. Tons of vapor with the large bore cone, and I'm using the same juice that is not heavy on the VG. Whatever it is, they have my vote for best battery of ego type.