Lets look past the stupid box warnings .. Machine and overall quality of this RTA is very good, threading seems good and a nice tension on the bottom O ring for the glass (more on that later) Build and wicking Love this build deck, so easy to build on, I use the top cap to measure the leads and cut flush with the bottom. Built some 3mm ID Fused Claptons, 6 wraps, came out at 0.25ohm I positioned the coils over the end of the bottom airflow so they are pushed out a bit for the side airflow, they are raised slightly so everything lines up. I used Kendo Gold Edition cotton and cut the cotton flush with the edge of the outer deck, this needs slightly more cotton than some RTA's do. Comb out the wicks and tidy up. Tuck the cotton into the juice wells, let the cotton find it's own way down, don't over stuff but you want the cotton to completely fill the juice well. Juice flow control and filling Top fill, there is no top fill ring the screws onto the chimney, the top cap screws directly on to the glass but the o ring keeps the glass in place, mine has never come off when filling, this is both a con and a pro because it does make it very easy to fill but I would of preferred a top ring if I'm honest. It wish the juice flow control had a bit more resistance when opening and closing it, it doesn't move when your vaping but it could be better, in saying that, it does it's job and I've had no leaking when filling it up, simply close the AFC and the JFC, fill, screw the top on and open the juice flow and airflow back up and vape. I've had zero dry hits either at higher wattage. They have bought out a new multi colored version that now has a top ring, i think it's on pre order still.. How does it vape ? Exceptional, the flavor you get from this is as good as the Aromamizer Plus and beats most, it is fantastic but what I like the most is the airflow, it is so smooth, much better than the Ammit Dual as the two sides of the decks airflow are separate on the Kylin, this gives you a much smoother draw and why I prefer this over the Ammit. Started out at 75w and stuck at 90w, no leaking or spitback, just a really nice vape, vaping on some whipped berries and you get all the flavor notes. Vapor production is good but that is going to depend on your build but this tank needs big chunky coils I feel. I used the bigger 6ml extension that comes with the RTA, the 2ml tank, your going to burn through juice in 15 puffs. Mine is the updated version that has an o ring seal on the chimney extension and comes with some colored o rings, hex wrench and grub screws. I have had zero leaking from the bottom, I know that there has been problems with the juice finding it's way down and getting on the 510 on your mod, this is due to the juice control, I'm not sure whether they have fixed it or I'm just lucky or it's just not happened yet. Pros Amazing flavor Well built and looks nice 25mm at the base or 24.5mm, I have forgotten but it tapers outward, this is done to stop overhang on some mods, some like it, some don't. 6ml extension included Extra 2ml glass included Takes Goon drip tips and includes 3 drip tips in the box, all Delrin Nice build deck, ease of build Wicks well with no leaks Beautiful smooth airflow Juice control Cons, some subjective No top fill ring Juice flow control could have a better tolerance No extra 6ml glass Really nice RTA !