I'm loving this thing already. Took longer than I'm used to for the batts to charge, of course. But with a 3.0 ohm carto (I think they are made by Smok Tech) and a light, fruity juice 3.9v seems to be the "sweet spot". Lots of vapor, the first warm vape I've experienced, and the taste of the juice is just perfect. You VV lovers sure know what you are talking about. I guess I was just imagining that every juice would be better at 4.2 to 5v for some reason. I guess that just isn't true in my case. Then again, I've never had an e-cig with regulated voltage output before, to get a true idea of the wattage I was getting.
This Torpedo almost makes me want to get a multimeter (though I'd have to learn how to use it).
So thank you again, TW, for this great product.