I got my order of Gs-air style from Fasttech...Well If your thinking of getting these do not bother, they are not worth the small difference in price to the authentic..
I also ordered an authentic but have not got it yet... so that is still to come..
I already had 2 GS-Airs from Cvapor and they work well.
The ones I got from Fasttech need a lot of work before you can vape them..
The center positive pin needs to be ground down it sticks out over 2mm..
The air control screw had to be worked to move in and out freely... and each 1 of the 3 I got has a different length air screw!
The air channels need to be filed smooth and then the metal shavings cleaned out..
The whole atty needs through cleaning for machine oil and metal shavings..
The best part for last.. only the drip tip that came with it fits....I tried several no luck..
The really sad part is all three came in a genuine looking Eleaf box complete with instruction sheet that looks the same as the original I got..

That means some people could get this and think it is an original.. real sad.. because an original works so well..
I gave it a bad review... here is a link for reference..
https://www.fasttech.com/products/2078202
BTW when I finish all that work.. I will post how it vapes.. but don't hold your breath... I still have a life..