The iStick 20 was my first step away from eGo devices. Still have it. I named the iStick 30 the number one mod of 2015 (go ahead, ask me why...).
As for pass through vaping, I don't do it even if the mod supports it. I do not feel it is safe enough to put a potentially explosive device up to my face and simultaneously straining, draining, and charging. By the time you've moved up to a box mod or a larger tube mod chances are you have a backup...
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