I have one of these. It has a build quality like an F, very solid with a metal barrel plate, but it is still a rubber dome at heart.
It uses quality honeywell domes, if I recall.
Also plate mounted domes are usually rather nice. I think it's part of why everyone likes topre so much.
I think samwisekoi got one as well and liked it.
I'll have to do some looking, but if you replace the keycaps and dome sheet (with hammers / springs) you can probably make this buckling spring and save a lot of effort cutting the case of a 122-key down to size.