While it's billed as being "Retroflective" (Devo?) to give the highest gain back in the direction the projector is and people say you should table mount your PJ to get the most out of it, it stands on it's own very well. I've used it on HT1100 and a HT510. It really helps out the HT510 and gives the 1100 a slight bump. The 1100 has a 3500:1 CR with Iris and the 510 is listed at 1200:1 but with the grey wolf the blacks are helped a great deal.
Compared to a matte white screen the projected image is more viewable with ambient light with the grey wolf.
I had tried grey screens in the past, most are .8, the grey wolf is glass beaded and suposedly 1.7 gain. The bottom line is that it's a sweet screen for digital projection, helps with viewing with some ambient light, pulls down the black level without much discernable muting of color, and helps reduce Screen Door Effect (SDE).
I can't believe the low price it goes for, definately a keeper.