Just received it. The base is a good bit heavier than I expected. Super solid. The pen is simple, but well made. It takes what appears to be a PILOT BRFN10 / BRFN30 style refill. The base opening is machined to be an exact fit to the pen body circumference with just a slight enough gap to allow gravity to push air out of the base, letting the pen slide slowly back into it once released at the top. When you pull out the pen swiftly, it makes a “pop” sound.
Would’ve been cool if they made a mechanical pencil companion of the same design.