I had the dual coil carto's from LiteCig and they worked just fine, with both the UltraFire 3000mah protected batteries and the AW IC 2200mah batteries I purchased separately. Even the Dual Coil LR Atty from LiteCig worked perfect, and is my favorite atty on this Mod. Their specs show it to range from 1.5ohm to 2ohm, and mine was beautiful at 1.8. I also stacked LifePO4 3v batteries with the 3.2ohm atomizers it came with, and not a single problem once they were dewicked.
I know this thread is a little old, but maybe it'll help someone out.
I loved the 510-N until I broke the switch unit (due to fault of my own, not a design flaw or otherwise), and I'll be buying the individual switch by itself after I get me a VV mod.