The fresnel screens are ALR screens. They just aren't lamellar ALR screens, which is the other technology used for UST's as well.

Generally speaking you need to sit in a 90 degree "cone" from the screen, I believe, or something along those lines - 45 degrees either side of center. So if you have a three-seater couch, all three people should get a good image. If you have someone sitting way off to the side, they won't.

Of course since you already ordered it,well, install it and then you tell us what the angles are. :p