I liked the e-power but looking at the kgo now. Just trying to find a pv with some good battery power also cheap replacement batteries parts ect Customer service...seems like a new e-cig vender comes out everyday. Ive been using a crappy No.7 that I overpaid for. It works for about 1 hour of constant puffing. I have to keep recharging the batteries through out the day. Ive been off reg cigs now for 2 months. Im just not getting the same nic out of this no.7