Actually, I believe he is correct. When you have dual coils, say a 2.1ohm in an iclear 30, even though your ohms meter will read 2.1, the resistance is effectively 4.2. According to a chart or just by taste, you would want to vape that at a much higher wattage than would be provided by 3.3v-3.7v. I tend to vape my iclear 30 and 30s around 8-9 watts, depending on the juice, on my MVP 2. My Vision Spinner just doesn't cut it unless I really crank it up.