In my opinion, if you want a 510 threaded battery type mod, the E-Power is the best and cheapest way to go, much cheaper in the long run than a Ego/Riva battery, and every part is replaceable unlike the Ego/Riva. If you ever think about a Ego-T don't do it, go with the Ego-c much easier to clean and dry burn and replaceable atty's for it are only around $5 or less and with the Ego-t they cant be replaced, so again much cheaper to operate. I do like the Ego-c, is a setup that has a refillable tank that you can take off and refill and has NO filler material in it like the cartomizers do. But like like some of the posters above, I would recommend the boge cartomizers for a beginner before trying some of the other systems. There is a learning curve with E-Cigs. I hope this is useful information. I have been vaping over a year and this is just my opinion.