I have both the Riva and the Ego. To compare the two in my own experience, I would say the Ego is better finished and has a little more "finesse". The Riva is more of a workhorse; to me it has a little more power behind it (it does has a 750mah batt compared to the 650mah in the Ego). I love them both, but for me the nod goes to the Riva. Just ordered another kit from Liberty-Flights, they are now back in stock at $29.99 and you get two atomizers with the starter kit and a great warranty.