It is a great mod for beginners and vets. My pops bought one for his first mod. It stays glued to his hand!!! He was at least a pack a day smoker for 35+ years and he now is a converted vapester! He has had it for a little over a month now and he finally used the USB to charge my sisters phone that was dying at the bar the other night. Charged it enough to get her trough the night and it still lasted the rest of the evening. Pretty sure it was close to fully charged before so it had plenty of energy to spare.