I think these are going to have the same problem projectors always have: room too bright and not enough candlepower in the projection. Now if the room is a bit dimly lit, then you could have the thing project all kinds of amazing things and the color gamut could be pretty good, but the room would have to be almost pitch black. And the walls painted with the silver screen stuff the make movie theater screens out of.
At least Magic Leap and the MS Hololens can actually block light (iirc) so making dark things isn’t unpossible. But then you have to wear a goofy headset.
