This picture is the iStick 20w version, don't mean to interject but you may wanna get the iStick 30w version. it has a cleaner output signal and can fire the subohm clearomizers. The 20w needs 1ohm to fire the 30w fires down to a 0.5.
iStick 20W and iStick 30W, which one you like more? see more informations at official site.