Experimental render engines such as VCM are not production ready - they will most probably give you persistent fireflies or some other issues.
Anyway, here is an update:
I tried experimenting with this material and here are my results:
translucentplastic-2015.max - scene in max 2015 format
nowindows - room rendered with no window geometry (light just enters the room with no obstacles)
windows-translucency - a material using translucency only
note: this seems to be the best (compared to references) and fastest result
windows-volumetric-sss - using volumetric SSS only
note: slow, noisy, and darker
windows-glass-caustics - using glass material with caustics enabled
note: fireflies, darker, some artifacts close to the windows
laser-translucency - laser pointer test, same material as in windows tests
notes: quite dark, and produces splotches because of uhd cache (switching to "animation" preset solves this, but the cache is computed slower)
laser-volume-sss - same material as in windows tests
notes: seems to look close to reality
laser-glass-caustics - same material as in windows tests
notes: noisy, doesn't look usable
Additional notes:
-There is also a "best?" material in the scene. It is a kind of mix between the glass material and the sss material. So it has reflections, but also scatters light.
-It would be probably possible to come up with a material which mixes various features using the rayswitch mtl - for example a material which scatters light using translucency, but in direct visibility it is just a solid white plane with reflections, or similar.
-When the light passes through an object, it is considered GI, and this GI light is clamped by the Max Sample Intensity parameter in the Render Setup > Performance tab. This means that in cases like this the light will become darker than it would be in real life. The solution is to increase the MSI value, but increasing it too high will produce fireflies which may never go away.
Conclusion:
Looks like translucency with reflections enabled should work best here, or the "best" material which is a mix of SSS and glass.