For the 0.5 ohm, they possèdents high air flow and produce a lot of steam. They have a mode variable wattage (15W - 30 W), a temperature control, but also the mode TCR that allows you to customize its configuration to vape.
For the 1.0 Ohm, air flow is less important and offers a draw more tight. It is also compatible with the temperature control, the variable power (10W TO 25 W) and the mode TCR.
For 1.5 Ohm, their air flow is moderate and has a draw slightly tight. It also has a mode variable wattage (8W - 20W). But not the temperature control and the mode TCR.