XtremeComputing has posted a review on the Dynamic Vibration Headphones (MSD-978VR)

I really enjoyed the subwoofer vibration when playing games especially FPS games, the guns and sounds around you sound so surreal like willing you to get absolutely engrossed in the game no matter what you're playing. I think these bass vibration headsets are the future for gamers because of this, a good example of this would be in CS source or Quake 4 and such, as the Bass shakes to your rocket launcher or as you feel the full force of a close nade it all adds to the realism of the game.

Dynamic Vibration Headphones (MSD-978VR) Review