Well since I am new I'm gunna keep to my builds over 1ohm. I was just thinkingto save the factory coils(.5 &1.2)that come with it since I have a huge package of cotton coming and 100' of 28g kanthal.been.practicing wrapping coils these last few days in preparation of doing all this.I plugged the RBA onto my istick n it ran .5 with the coil in It(no cotton as I figured I wudnt use it so I didn't prep) then found a coil I made yesterday n undid screws in rba n plugged mine in...1ohm 4.4v 20w,primed it did a dry hit n no burn smell,put rba on subtank mini nd on istick nd it was fine for me hit wise(clouds r cool but if lower v&w works fine n saves battery then I'm with tht)no leaks no hissing,nothing I thought I might hear small sounds of putting my own coil for first time..hit great.I actually just came back from e-cig shop few blocks away n it hadn't opened yet so I'm home n wondering if since I didn't blow up if using tht setup on rba is okay for now?