The video by John Stevens from his Mutley's Hangar review demonstrates the DHM effects, Camera transition, Landing Effects and Automatic Head Movement which are all variable and set with slider controls

This excellent video was made by Alexis to showcase how Opus stands from the competition, bringing for the first time in FS History an authentic weather system simulation. You can see incoming bad weather as you approach a cold front, you descent into true overcast condition, depending on the conditions you will spend hours with no visual with the ground, you will have only clouds below you. Easily the most revolutionary thing to happen to the FS world for a long time!

These short videos from Johan nicely demonstrate the very realistic intelligent turbulence effects on the aircraft which are fully harmonised with the DHM accelerometer data.

This video from Mike demonstrates external camera views and  turbulence on a fast ride to Amsterdam.

Alexis's video demonstrates the fog effect.

"I recorded this video to show you guys how fantastic this Weather Engine is. I have never before been able to get a real Overcast Condition with my FSX. The Weather Engines would try to cover the ground with Fog, but you could see through it, as this is an FS Limitation. Anyway. This airport had a pretty bad FOG limiting the visibility to only 100Meters, and no wind to blow it away, pretty much a pilot nightmare. To give an authentic Simulation of this conditions, you shouldn't be able to see the ground as you approach the airport, because of the FOG over it, if you can see the runway before penetrating the FOG Layer, then your simulation is not realistic anymore, since that's absolutely not what you would find in RW. You can't see if you're landing on the runway, or heading direct to a Residential Building until seconds from the touchdown, you have to rely on your instruments all the time. FSX never had this feeling, now with OpusFSX I Really believe they have found several ways to make it more realistic than ever, and I have recorded this video so you could see it with your own eyes."

Courtesy of fiftysix, a flight showing thunderstorms at Walter Suttons with P3D v2.3

Courtesy of fiftysix, a flight around Yosemite with P3D v2.2 volumetric fog 

Courtesy of fiftysix, P3D v2.2 dense cloud 

Mobarak has posted this video showing the mist effects

Mobarak's video showing the snow effects

Mobarak's video showing mist and snow effects

FSwakevortex's video of a Norwegian Boeing 737-800 departing into a weather front from the beautiful city of Bergen [Flesland].

Tomek's video showing his OpusFSX Live View setup

Steadyflyer's video comparing three weather engines.

5 airports - 3 weather engines with live downloaded weather

Xsimreviews review using OpusSFX camera effects and turbulent motions with AccuFeel sounds effects.