I was intrigued, so I bought one about a month ago.
The best thing about this, to me at least, is you can change the intensity of the different flavors by increasing or decreasing how hot the coil burns.
For example, Caramel tastes most like caramel at the lowest voltage setting. Same with vanilla. But most flavors burn better and give more vape at 4 to 5 volts.
The ego-C battery is 4 volts and puts out 3.8 volts after the small circuit and led button.
The twist is adjustable from 3.8 to 4.8 volts output. I haven't taken it apart to tell what the battery voltage is because I want to be able to continue to use it (I don't have the equipment to put it back together). It's a lot cheaper than other adjustable systems and simple.
About a year and a half ago when I started vaping and was looking at this forum more (much more) there was a lot of claims about the "sweet spot" being 5volts and people with mods to make a 5 volt vape output by sometimes silly methods, like taking an electric drill, removing the drill part, putting an ecig screw in adapter where the motor was and vaping at 5 volts!
