I sent mine twice to gotvape 1st time i was told there was a second update , took 3 weeks , got it back with note saying they raised each temp by 40 deg and there was a 2nd update , when i got it back it would not heat up properly. I emailed goboof direct and was told there was only 1 update and they shouldn't have raised the temps. Second time sending it back to gotvape they stated nothing was wrong with it and just kept my unit, I did not have a good experience ,I dont want to really get in-depth on the subject but went to goboof direct again and they took care of me and a happy forum member now owns it. I got another one from a friend of mine in trade and it works perfectly , a total night and day difference from the one gotvape said they had fixed. There is my experience and i am hoping you have a better one and get a working unit back in a timely fashion. Also i don't think they are right in charging you shipping for something like this , that is why there is a warranty in place , i could understand if you broke it but that's not the case.