I see many people complaining about the Rn4081, i luv this device, it works best with a dripomizer and a manual batt, more than enuff hit, but you must clean the inside of the batt, thread, get the gunk out with a tissue, they will perform better, 18mg of PG juice is nice.I was using cartomizers but they taste a bit nasty to me and they dont give as good as a hit or feel as good as a dripomizer.