Many have reported issues with the outdated eGo "
tank" system (cartridge+atomizer). As for the Joytech eGo it fires @ 3.4 volts. Riva, Kgo fire @ 3.7 volts. I've used cartos, carto+
tank, Stardusts and Vivi Novas. I prefer the Vivi over the Stardust because it of far superior build quality. I DIY and add extra flavor. With proper maintenance/ washing, dry burning- my heads are lasting 6+ weeks. I still occasionally enjoy
vaping a 1.7 Smok Tech XL single coil in a tank but prefer the Vivi.