I bought a pack of these and for the most part I think they are great, I do not have a hard draw and have ran about 20ml of unflavored Nic
juice through 2 of them and they are still performing great. The only con I can think of is you have to be gentle very gentle with these units. If you drop them best case scenario is the tank falls off and you loose all your
juice and make a mess or worst case is the tank cracks, both of which I have experienced. They should design the tank to screw on and not push on and maybe have a metal band around the bottom for support to keep it from cracking. I will continue to order these. I think they outperform the EGo-C atomizer and hold almost 2X the juice, and matched up with the latest EGo Twist VV battery, it makes my world GREAT!!