I've tried the V2cig and I can tell you like this:
Battery (middle size-a bit longer than a regular cigg. more like a 100's in length) goes for almost a full day if you use it fairly moderate.
They offer you 18,12,6 and 0 mg of nicotine in there liquids and the prefilled cartomizers. 18mg should remind you of a full cigg and well, the throathit is way stronger than my normal cigg I used to smoke and then I used a brand that was called Look Original and John Silver wich is pretty strong good analogs.
The V2 taste like a kind of sweet candy mixed with some strange smoke flavour to it although it's not discusting. It's fully smokeable.
The red on is supposed to taste lika a Marlboro Red but doesn't taste like a real one at all. The throathit of 18mg is fairly good, just a tad harder than the real one.
The yellow one is supposed to taste like turkish tobacco / euro flavour...
It doesn't taste like any cigg I've tried before. The T-hit is way stronger than any cigg I ever tried so this one can hurt.
I would not be happy with this today if I could test em before I bought them, also their flavour has a sweet taste that I don't really like but on the other hand, I have only vaped about a week now so still has a lot to learn.
They for sure can keep you off the regular ciggs if you really wana to.