So far, I'm liking it. I rinsed it out before using, and there was trace amounts of blue ink already in the pen. Mysterious.
I filled it with Noodler's Heart of Darkness, and it writes very smoothly. Left it sitting overnight, and it continued writing smoothly this morning with no hiccups whatsoever. Very nice! It's supposed to be a "fine," but it really seems like more of a "medium" to me. It comes with a piston filling cartridge converter which didn't seem removable at first, but it just slides out if you pull on it a little.
I got it from AliExpress, if you're wondering. It will surely be available on eBay soon enough.
I bought a majohn A1 and it came branded moonman, so could be the same product?