The vaporizer I am very satisfied, hardly drooling Liquid and the coils have an acceptable lifetime. The mouthpiece of metal but I do not like. As with all evaporators I met so far and the documentation is very poor and so I learned by chance that the mouthpiece "Driptip" is and what it is made of plastic which I feel comfortable. Overall fair value for money and I want to be a recommendation to buy the steamer for all smokers.