I'm very happy to hear from someone who's seen the Blackhawk, especially since you've seen it twice! Thank you!
In my original post, I was confusing lenticular with fresnel. I read one article in which they referred to both layers as lenticular layers. I read another article at the Da-Lite site that was talking about artifacts caused by the lenticular layer, but when I read it before I was thinking they were talking about the fresnel layer. So I guess the fresnel layer is not generally going to cause artifact problems.
That's good news that the Blackhawk looked good with a digital projector! I was hoping to find someone who had seen it with a digital projector because I would think if there were problems with artifacts, they would come out when using digital projection.
I know that the motivation for Blackhawk was professional use in high ambient light, which makes me wonder if it could really be expected to give great picture quality for a home theater setup. The half gain viewing angle is only 50 degrees, and while that's a good viewing angle for a rear screen, especially considering the high gain, those specifications don't really compete with front projection screens. Actually, I guess I don't really understand viewing angle specifications, because the viewing angle of the Blackhawk is listed as 180 degrees. It seems like most of the Stewart screens, both front and rear projection, have viewing angles 160 degrees or higher, even though sometimes the half gain is mentioned in the specifications, and it's usually a lot lower.
Da-Lite seems to really like rear projection. Their argument is that, even if the lights are out in a room with dark surfaces, front projection is going to look a little washed out from light reflecting directly from one part of the screen to another, and from the light reflecting from the screen to the viewers and back to the screen again.
So how do you think the Blackhawk compares to a good front projection setup? Assuming optimal lighting conditions, would you say that the Blackhawk had better or worse picture quality than front projection? Assuming screen cost and space for rear projection without mirrors was not a problem, but you were watching everything in a completely dark room anyway, would you want the Blackhawk? If I determined that even rear projection with something as expensive as the Blackhawk didn't beat front projection, that would pretty much kill my interest in rear projection, and I would just commit to doing front projection.