When Sony first announced their black-screen technology, and the masses agreed that this sounded really cool. A screen that only reflected red, green, and blue light, so that it can be used in a room with lights on. And the screen is black! Neato!

As it turns out, the screen is actually dark-grey. But it is still worth checking out. ultimate AV has a review:

Keep in mind that there are an infinite variety of interior lighting schemes that might be used with the ChromaVue. In the setup I used, it can provide an improved image over a high-quality white screen. But with the most difficult program material, which plays an important role in many films, you’ll need to keep the room lighting well subdued, even with this screen. The ChromaVue certainly can’t be expected to compete with bright sunlight. You’ll still get the best image any projector is capable of providing by using a good, conventional screen in a totally darkened room. But if your room’s ambient light can’t be completely controlled, and you have a suitable projector, the ChromaVue might help you see a better picture under less-than-ideal conditions.

Link: ultimate AV - Sony HCS-80 ChromaVue High-Contrast Home Theater Screen