The Volt X2 is eGo-sized, but has the more-consistent behavior of their cig-sized batteries and is compatible with them for cartos, so I have 2 of each (1 auto, 1 manual) --I'm finding myself increasingly ignoring the cig-sized one but it was a smooth transition. I use the automatics in the car, since the car is *NOT* an automatici was also thinking of getting a volt. but have been convinced into get an ego-c set instead due to the volt's short battery life. maybe i'll get the ego twist battery as well.
I like the Bloog cartomizers better with the X2, better vapor. .2 ohms less resistance.
High voltage is not needed, high WATTAGE is needed (but not too high!) So people tend to recommend certain cartomizers with certain batteries because of how the equation works out: watts = (volts X volts)/ohms