Ok I have been using the R-Mod for a few days now and I have to say its terrific! Out of the box I checked the OHM's and it was 2.1 so I started at 4.3 volts, vapor production and flavor were fine and like Chopper said no dry hits even when I tried to get a dry hit I couldn't. went to 4.5 than 4.7 and all the way to 5v and it seems very stable.
It is very easy to take apart and the screw on top is a better feature over the AB although I like the look of the AB on my provari a little better but thats just me.
Chopper has a winner with the R-Mod at the price point he has it set at and the quality of the product it cant be beat, vapor production and flavor are way better than my DID (which is up for sale now!) and slightly better than my AB and I am very happy with it. Get one you wont be disappointed.