Over this past weekend and I was bored so I figured I'd play with the Axis RDA. I got the Axis RDA (clone) in a kit. It has bottom and side airflow. I put some coils in it horizontally. No matter what I did it wasn't good. So I put in a set of coils vertically. Wow what a difference. I was really suprised. It's still not great but it's pretty good. I'll use it now. Now I need to do some more work on the mech mod.