I'm a newbie I guess, Ive been on and off vaping for two years. I finally found a device I like. I haven't had an analog in a month. I started on a kr808 with cartomizers. Not a lot of vapor not very satisfying. It was untill I bought the Njoy Npro. and used my own e-juice from vaporrenu that I was satisfied enough to take the next step and quit smoking analogs. Still Im on the go a lot and the battery doesn't last long enough. These tank systems seem to give good vapor, lonng batt life and easily filled carts should I get on, and which is the best product for the mony thanx everyone MrVapist