I received this in the mail a couple of days ago. I am very happy with it. There is one small thing however that is annoying me and I don't know if it's normal or if it's design flaw. I understand that the airflow ring is supposed to be loose so that you can adjust the airflow easily however I noticed there is a small Gap between the ring that you use to adjust the airflow and the top portion of the cap that covers the tank and no matter what airflow setting I have it at I feel like when I inhale especially on a long drag that air is coming up through this Gap is this normal and is anyone else experiencing this?