Hay, bought the Defcon, and was really excited about it specially because of the price, but the Defcon was not what I expected. There was tool marks, and grinding swirls on the bottom, then the air hole looked like it was done with a nail and hammer, but the leaking was bad. The kicker for me was I tested the glob of solder in the bottom the tank that was in direct contact with the ejuice, and it tested positive for lead!! Not something I want to be mixing with my juice, and putting into my lungs. Bad enough I smoked for over 25 years. I am trying to do this whole thing healthier, and lead is not the way to go. I sent it back to Chopper and got a full refund!!! As for Chopper, he a a super cool guy to deal with, and NO complaints with him, I just did not like the Defcon, and we are all entitled to our own opinions!! But the lead thing just sealed the deal for me. I am sure that lead is present in more things then I could imagin, but I know that the Zenesis don't have any!! I test the solder with a lead test kit that I got from Amazon, and it was the best $12 that I have spent!!! If anyone is interested go the Amazon and just search lead test kits!!!