I bought some Mantic Terrain Crate stuff for use in my building projects, specifically the 'Town Centre' kit. Website is here:
https://www.manticgames.com/games/terrain-crate/What I got in my set:
This is all roughly 28mm/32mm scale, although some of it seemed slightly out of scale with each other. For example, the grey plastic wall sets seem too slim for Warhammer purposes, whilst some of the crates and barrels in the brown plastic seem too big. The large obelisk thing is, frankly, massive and awful.
The overall quality of the sculpting is pretty good, and it feels similar in style to GW stuff overall. My main gripe is the plastic quality: stuff I got was more of a rubbery, slightly bendy plastic, so some of the larger and longer pieces were actually a little warped, or flexible in the case of thin things, like the cartwheels which were not at all road safe. Also, the plastic has a slight sheen to it and doesn't take paint that well, even after being primed.
Overall though it was kinda the right stuff for what I needed and good to add some colour to terrain imo.