Ok (20 October 2018)
I have had all 3 types of coils. The best one for me is the 0.4 ones. I have been vaping them at the recommended range, averaging around 50w. They seem to last roughly around a week with the right type of juice. I have found that these coils do not like any type of sweet fruity sour juice and they just burn out after a couple of days. But all in all, a great coil.