I would concur with many of the statements on this tank. No leaking, super smooth airflow, easy to build, flavor, etc. It's so good that it has replaced one of my kayfun v5s in the daily rotation. That's how I view it; as a better kayfun v5. Cannot really speak to the mtl 1mm aspect of it. Currently happy with a SS 26/26/36 gauge 2.5mm id fused clapton 4.5 wrap in it. Like it so much I ordered a black one.