I can't speak much to voltages but I can attest to the quality of the eGo. I started out on a 510 and recently upgraded to the eGo. Its a 510 on some serious steroids, its got massive battery life(mine lasts all day at my 10 hour work shift and then some at home, medium level of use). The vapor production is fantastic, the flavor is great and it looks snazzy. It beats the 510 on every level but you don't have to sacrifice potability. With the 510 I have a assembled unit, the PCC with its stuff inside and a bottle of juice. With the eGo all I have to do is grab it and 3ml bottle and I'm all set for a full day of vaping and it takes up less space overall then what I needed to carry the 510 stuff. You also don't have to worry about juice leaking out all, and you don't have to change your batt every hour. It just sits in wait and works when you need it, the hit stays strong all the way to the end of the batt.
A big two thumbs up, its a fantastic unit.