OP you already know the differences between the two models, so all i can contribute is - I upgraded from Joye 510 to my Riva over a month ago and its always pure pleasure. Im impressed by everything about it and would change nothing. I even have a 5V PT that i hardly ever use; if anything, im more likely to throw a LR atty on the Riva. But usually im just vaping away at 3.7V.