By adjusting your vape wattage, the temperature produced in the coil to heat the e-liquid is customised, allowing you to fine-tune your vaping experience to your personal preferences. Each tank has its own coil with its own resistance. Essentially, the lower the resistance, the more wattage the MOD requires. I am happy about this and if it can help in adjusting the perfect rate of vape then nothing is greater than that. It is amazing and the $53 price seems justified to me as well.