30MM 1/144 EXA FAHRZEUG (Horse Mecha Ver.)[Dunkelgrau]

Compatible with the Spinatio Knight and has an adapter to turn it into a centaur, replacing the head with the torso of the Knight.
Also comes in white, to match the white Royal Knight (not to be confused with the 30MF Knight). You can additionally add the 30MS wings (white and black) to further customize them (more example pictures available on the Knight pages).

Aesthetics:
It's a grey mecha horse with a transparent green visor or canopy. It fits well in scale with 1/144 models or the 30 line (MM/MS), but it's pretty small compared to a 30MF model and larger - More of a pony than a horse in that regard.

Mechanics:
The legs use plastic ball joints on 3mm pegs to connect to the two halves of the body (comes apart easily) and C-clip knees, which makes the legs overall a little sloppy.
The midsection, tail and neck/adapter use polycap ball joints, which are also somewhat sloppy, which means that the model when it has a rider and/or is a centaur will easily lose its pose.

The model is full of 3mm holes and several C-clip rods, which you can attach a variety of equipment and expansions onto. The Spinatio Knights come with a C-clip to 3mm adapter to seat them as riders.

You can combine various 30MM legs with the horse legs, such as the Spinatio models, due to the C-clip knees, enabling you to make a variety of centaurs or hybrid models, to make various large four legged assault mechs.
You can also do other stuff, like use the rear half as a lower body for a mech and even stand it on its hindlegs to make an awkward standing monstrosity - Point being there are a lot of options if you're creative.
The head can be attached onto other things by itself (and have things attached to it) to be used as a cockpit for something else, however the ears are not detachable at all.

Conclusion:
Relative to other models, it's pretty cheap and while it's not great for posing, you can tighten up the joints to make it more stable and it does have a lot of variety.
The four shoulders are ball sockets, but you can use 3mm to 3mm pegs (or a length of cut out runner) to attach the legs in other places, though they'll only be able to swing and not pivot.

I feel like there's a missed opportunity to make the ears detachable and be used on other stuff, but apart from that it's a decent mid-tier kit.