EGo batts are regulated, unless you mod them.
Great example! I bought a Provari, and I'm very happy with it, but I find with the fruit juices I prefer, I'm not really using the higher wattage. The eGo twist is a great inexpensive way to try VV to see if you like it, and will serve as a back up/out and about device if you do decide to go bigger.I do notice a big difference in ejuices when I vape at different voltages. For example, yesterday I was vaping a chocolate at a 5.0V on my Provari, then swapped tanks to a blueberry lemonade. I was wondering why the juice felt like it was "burning" my tongue! Then I realized the voltage I had it set at. I dialed it back to 3.6V, then got the sweet taste of blueberry with a muted citrus taste. VV does bring you to the next level and I do highly recommend it, even if you're only going for an EGO Twist. Really, it's the WATTAGE that determines the sweet spot for your juices, but altering the volts (using Ohm's Law) in combination with the resistance of your atomizer/clearomizer will get you there. I just ordered a Tesla (VW) so I could regulate the wattage without doing physics.