I hate the damage on the Mega, the bottom part that you unscrew to refill/change attys jammed on and could only remove it with pliers, one set on the inner chimney and one on the bottom. You can see the force I had to use. Luckily the OCC's in the sub tank changed the whole Vaping field in my eyes. I still cough with the amount of flavor/Vape it kicks out. I am thinking of reducing the nic to lowest and working my way up the strengths until I find a good middle ground.
Edit: Just to clarify the Mega is now retired. Nothing can beat the sub in my eyes.