Power = Heat
With variable voltage it is easy to change the amount of power going into the atomizer which has the greatest impact on
throat hit and warm of vapor.
P=VV/R. Power in Watts is equal to Voltage squared divided by resistance in Ohms. You can adjust your power by changing atomizers of different resistances or you can adjust your shiney new
mod to a different voltage.
The biggest advantage is power adjustment. Secondary advantages include, shiney and new. Place your value on each and order, or don't order, accordingly.