How do diffusers sound?

That's pretty interesting. Setting some kind of binaural demo seems like a good way for potential acoustics customers to try before they buy. I have a recorder which supports ambisonic recording but not a mic. Regardless, I don't have diffusion either nor have I used it.

There are so many immersive formats lately: ambisonic, Atmos, Spatial Audio... Though it's highly unlikely a majority proportion of audio enthusiasts will install a legit Atmos setup, some headphones and headphone correction software are trying to get you close.

I'm still in stereoville myself.