The Ego-C Twist is a Variable Voltage Ego battery that uses ego-threading as well as 510 threading. You can use anything with those threads: Evod/Protank/T3S, Stardust/CE4/CE5, Puritanks, Iclears, 510 cartomizers/cartotanks, 510 atomizers, etc.
With ego/510 connection, the skies the limit as far as finding
juice delivery devices to fit.
My personal favorites are the iclears: dual top coils that delivery a warm vape, clean and clear flavor, and clouds of vapor. It's a slightly tighter draw than Evod/Protanks and the like, but that's why I like them so much.
Welcome to ECF. Feel free to ask anything!