Geekvape Zeus X RTA
It's 25mm at the base, but flares out up to 29mm around the bubble glass. With the bubble glass, it'll hild 4.5ml. With the included straight glass (which also reduces the overall diameter to around 26mm), the capacity is reduced to 3.5ml. From the top of the stubby, but comfy drip tip to the bottom of the protruding 510 pin, it is roughly 48mm tall.
Taking cues, I believe, from the Advken CP TF, the Zeus X uses a removable that directs the air to the top, sides, and bottom of the coils. Where the Advken CP TF is designed to be a single coil RTA, this one is designed to be dual (but the deck will allow for a single big coil).
Building is pretty easy, but not as easy as the Zeus Dual (or many other postless deck designs). The coils can be clipped with between 4mm and 5mm legs, but rather than setting all the way down, they can - should - be adjusted so that the legs which are placed through an inverted, squared off horseshoe kind of affair, do not touch the deck. They claim that the raised deck will allow leads to be clipped after installation, but it's a very tiny space for flush cuts...
Once installed, the coils need to be wicked. Wicking is also pretty easy. The ends do not need to be combed out too much... Just a little... Then tucked in to the wick ports. The wicks do not need to reach the deck, and should not be too tight in the ports.
Apparently, I forgot to take a pic of the wicks tucked in. Huh...
I find it easier to install the chimney - it's held in place with o-rings - into the tank, then install the deck, lining up the tabs on the deck with the slots in the sides of the chimney.
Like most other recent Geekvape RTAs, the Zeus X uses a tab lock system for to removable top cap. About 1/2 turn gets to top off and filling proceeds as usual through two kidney shaped holes.
The holes are relatively small, though... Still, filling it has not been an issue.
Air comes in the top, over and through the chimney to hit the coils.
There's a lot of air, and the AFC is stoppered and will adjust down to a very tight draw - almost a loose MTL (but not a very good MTL vape). As such, vapor production is what you'd expect. Flavor is above average, too.