1 ohm is less vapor and less air more MTL like, .5 is more of a restricted lung hitKind of a late bump on this one.. But I was looking through this thread again, saw this, and the code still works, so it's still $7... As long as the shipping isn't 20 bucks, I was gonna order this up, as well as a pack of coils... Just wondering which ones to go with and why.. The .5 ohm, or the 1 ohm.. It has the chip that regulates the voltage based off the coil impedance , but don't know why I should pick one over another