I've had this mod for about 2 weeks now and it performs as should. I WILL insist on giving a tip for this device though.
I've noticed that on mine anyway, liquid seeps past the 510 seal slightly and I solved this with just dropping an o-ring that fits snugly around the 510 connection pin. I screw the atomizer in and it stays tight and dry.
Yes, I have taken it apart to diagnose the issue and that's what I found. Other than that, it's good to go.