I have been using the Arctic v2 for my goto clearomizer. You can purchase factory made coils in either the single coil variety or the double coil variety. I have been using and rebuilding the single coil variety since I have owned this tank and all has been wonderful. Just today though, I decided to try the double coiled version and man oh man to my surprise it made a vast difference in performance. I was expecting somewhat of a difference but not as much as I have witnessed. The double coils produce about 3 times as much vapor as the single coils do with this tank. The tank does excellent with single coils but these double coils really get with the program. So if any of you know about this particular tank and haven't yet tried the double coils then by all means do so.