The Kick is a variable wattage unit that's designed for 18650 cylindrical tube
mods.
It's completely useless in something that already has Variable Voltage technology. The ProVari and the VMax already have VV tech in them, so the kick wouldn't do anything.
Voltage X Voltage / Resistance (Ohms) = Wattage. The kick adjusts the final outcome. You can achieve the same results with a ProVari or VMax by adjusting the voltage. It's more designed for something like a Silver Bullet.