Compared to a typical matte white screen, Black Diamond increases contrast by 900%. Black Diamond's light-rejection capabilities also help preserve the projector's color accuracy, because ambient light from the room can be affected by things like wall color. Black Diamond also scatters less of the projector's light as it's reflected back toward viewers, so that images retain the full sharpness of the projector and source material.
When Screen Innovations visited Crutchfield, the trainer demonstrated this feature by shining a laser pointer on several different screen materials. The Black Diamond material definitely displayed the sharpest dot from the pointer.
The Zero Edge screen's frame has an ultra-slim 1/2" bezel that makes the screen appear to float in mid-air.