I bought this tank to check out since it was very cheap. Boy was I delighted when I opened the package! The design of this tank is near perfect! It has a great chimney: It is not too wide to loose vapor density and it's not too tight to miss airflow and flavor. it is wide enough to send a condensed flavorful vapor your way. The airflow can range from mouth to lung to direct lung. The deck design is Kayfun-ish perfect: it's more forgiving and allows for larger size wires bigger coils. It also has a juice control that is a much more simplified version, we see in Kayfun v4. The threads are very smooth and help with the juice control. And it actually works! This is how a Kayfun v4 Mini should've been designed. The black color is plated, very high quality and durable. The only con I can think of is, regrettably, it has too low a capacity to be counted as my primary daily tank. A larger tank would have also forced the chimney a little taller, and had made the vapor a little cooler. It is still up there as one of my most used, top 3 favorite tanks. Definitely, a big, pleasant surprise. If you're looking for something functional, well designed, and with good flavor vape, give this tank a try. Highly recommended!