I just received mine... Don't try using this with a Kanger T3 or other bottom-loading tanks... the connection sits down too far inside the control head, and often gets stuck there. Then I have to use pliers to unscrew the base. (I've accidentally dumped juice all over me twice because of this)
Otherwise, nice product.
The eVic and CVI are the same way. Until the threads are broken in, its best to remove the Kangers while the mod is upside down....