corb06 I tried multiple ways of watching movies on my G2 (including Virtual Desktop as my 2nd choice), but settled on SkyBox VR as providing the most convenient smooth playback. Yes, this is via Steam for G2.
As movies are typically 24fps (23.976 to be precise), it is important that this is rendered correctly to ensure smooth playback / smooth panning etc.
Even though the G2 itself renders at 90Hz (and the Q2 typically at 72Hz or 90Hz), the conversion of the video FPS seems to be handled well with SkyBox VR.
For example, when I use Virtual Desktop for movie playback it is important that your PC Desktop refresh rate matches the video FPS, otherwise the video can be very choppy. I do this via MPC-HD + MadVR, which allows 24FPS movies to automatically switch the PC Desktop frame rate to 24Hz (to match the video). Although the VR Headset is rendering at 90Hz, the video playback is acceptably smooth. If the desktop remained at 60Hz, then any 24FPS movie is not smooth! I suspect this is due to the additional framerate conversion that would be going on (24Hz -> 60Hz -> 90Hz).
SkyBox VR seems able to present video just as smoothly as this Virtual Desktop experience, so the convenience of SkyBox VR wins out for me.
The only other thought is that the Q2's 72Hz capability may have a playback smoothness advantage over the G2, for 24FPS movie viewing (72Hz being an exact multiple of 24Hz). But in terms of overall picture quality and sharpness, my G2 is my "go to" for movie viewing. Note also, that I printed a shallower face gasket for my G2 which improved the FOV and sweetspot size, further improving my virtual cinema experience. So I'm really enjoying rewatching all my ripped 3D blu-ray movies in my G2 SkyBox VR cinema!
We just need SkyBox to fix the Aspect Ratio issue with 3D Full SBS movies. Currently you need to override, in advanced settings, to force 16:9 Aspect Ratio, everytime you play the movie (as the Aspect Ratio defaults to a stretched 32:9, and changing the setting to 16:9 is also sadly not retained for each movie).
Hope this all helps. :-)