I have used the .6, the 1.0 and the 1.5 clapton in mine. I honestly don't find much difference in flavor or hit between those three (yeah, the .6 is stronger, but not that much). However, I use a lot less liquid and longer battery life between charges when I use the higher ohm coils. The .6 ohm will give me 4-5 hours (of course I have to refill the
tank), the 1.0 will give me 6-7 hours. Also, if you turn the light off, that will get longer run time.