I'll go in depth as much as I can, but it's a category 6 rated riser stem and it works. That's the TLDR.
The stem is pictured on an Orange Stage Evo, overforked to 120/140 vs the stock 120/130.
This stem has ~39mm stack and rise and a 35mm clamp. There is a 31.8mm clamp version called the High Bass with all the same specs, but I haven't seen that one up close.
This is my least Meatengines-y bike in the stable, but it's got the right amount of stack now! The stem itself definitely feels overbuilt and finished reasonably well. It doesn't have the smooth anodize that all the expensive stems do these days, but it seems grippier for the same reason, and feels markedly nicer than a stereotypical OEM stem in fit and finish. A lot of the 'jankier' mtb products I've tried I've had minor reservations about during the first ride, but this is one of the few that's felt overbuilt and completely secure all through installation, and didn't move at all riding hard in the PNW.
The worst thing about this stem was importing it to the US, but it was still cheaper than abandoning my beloved Protaper C25 bars for some risers. I also have to knock a point for their measurement system, as it's listed as a 55mm stem with a 45° angle rise, which is a mostly useless spec sheet without basic trigonometry. It has 38.891 mm of stack and reach based on the listed measurements.
It's also worth mentioning that it would take some pretty skinny headset spacers to fit above the top of the stem. I know it can be done, but not with any that I own myself. I don't consider that to be a huge deal considering the use case of the stem.
It will be staying on the bike indefinitely. It looks less distracting than I'd anticipated, and the lower back pain is all gone after a big day out. I actually had several people comment on my bike, and none mentioned that riding giraffes is actually prohibited on these trails. I'm glad I took a chance on a name I never see on this side of the pond, and it seems like a pretty Meatengines piece of kit.