I used the two included Clapton coils and wicked it with rayon. Measures out to be 0.17 ohms. It's chucking some serious clouds at just 50 watts. Holding the mod with the top cap towards the bottom and the fire button under my index finger, the front edges around the screen does feel a bit sharp. A better design choice would have been to round those edges a bit more. Tried it at 80 watts and it's like stomping on the accelerator of a race car. And this is with the preheat set to normal. Also tried it at 60 watts and I prefer the slower, smoother draw you can get at 50 watts.