On a Vamo 5-7 watts is 5-7 watts no matter what you screw on top. So yes, *any* atty above 1.2 ohms will be fine on it, in VW mode. Rather than doing a bunch of math and adjusting VV (variable voltage) yourself, which gives you wattage, you set your watts on the vamo and it polls the attached device for it's resistance and automagically adjusts the voltage for you.
If you are curious about the math, here it is:
Amps = Volts/Resistance
Watts = Volts x Amps
Watts = (Volts x Volts)/Resistance
Volts = square root of (Watts x Resistance)
thank you. now another question, does anyone know where to get good e-juice? of would a DIY be better?