Have they only washed with warm water (Only the sleeve and the mouthpiece) then filled (liquid with nicotine)
Waited five minutes so that the wick and soak it in my ego c battery.
So far no problems seen there are no leaks (compared to the original joyteh tanks the only siffen !!! is a blessing)
Taste is very good, a lot of steam and no unpleasant taste or liquid in the mouth.
Visually see the construction ego c battery black with the fusion vaporizer very demanding of.
Pay for a few days / weeks an update bringing to report the long-term behavior.
Conclusion: Definitive Purchase recommendation