hate to sound rude, but reports of leaks are just dumb people that probably just started vaping and have no clue what they're doing, or using some cheap clones. granted there are legitimate cases where a defective tank leaks and what not, but almost all of the time the leaks are user error, either over tightening and smashing the crap out of the o-rings or too loose.
it's like the protanks, ive heard of people complaining they leak, but i've had several tanks and over the past two years not a single leak out of any of them, even the tanks that are full and just sitting on the shelf for months at a time. heck, im still using the original o-rings.. and on top of that i soak my tanks occasionally in alcohol to clean them out and that is not recommend because it can ruin the seals, yet my tanks are still perfectly leak-free.