Repeating to accentuate or affirm last couple posts; I have both RM2 and Origen2 b/f on my Reo Grand's... I couldn't imagine going without either.
Which means you have to go with at least 2 Reo's...
What distinguishes the bigger one or one's is the bigger air flow (for one thing)... because i get so much delicious vapor from the Origen even at its smallest setting, I was thinking of opening the air on the RM2 a tad (but its not even necessary).
In my experience I've found most dual coil, dual air
rda's, large width, the flavor was overshadowed by the volume of vapor for some reason.
The Origen is an exception... i wonder how the iGo wide ones and the RM4 stack up.