I love my V2, but I will say that there was a fairly steep learning curve to figure out on it for me. First, I am not used to there being any play/movement on switches/connectors on my gadgets so it really surprised me to discover that I get a better vape when I tighten the adapter down, then loosen it about 1/4-1/2 rotation and press the switch in and towards the atty slightly when I use it. Also, I started out with a 901 atty, then switched to the 808 cartos. As with my 3.7v
device, this has given me a much longer battery life in the V2. Not entirely sure as to why since it was many moons ago that I studied electricity in physics. Anyway, before this gets too long winded I will wrap it up and leave you with this: get a V2, they rock!