OK--here are some shots of my screen. I would have thought that the gray was too dark, but I have tested it extensively tonight with a bunch of DVDs, and all I can say is that the image is absolutely fantastic. Here are some photos of my setup. Unfortunately, if you look really closely, you can see ever so slight vertical bands (vertical painting stripes) on the images taken with the flash. Playing a movie, the vertical bands do not show up at all.
Also, I kept my screen rolled up completely today, and I could detect some horizontal banding caused by memory of the screen being in the roll-up position (I think you can barely see some in the first photo below), but it wasn't long before these fell right out of the screen. In fact, I believe these horizontal bands were caused more by the fact that after I rolled up my screen, I placed it on a flat surface, rather than let it hang (the flat surface was as wide as the horizontal bands are in the first photo below). After a bit of a mishap a couple of days ago with my screen, I was able to get it up and running tonight.
Here are some photos (of both my screen, and my DIY electric roll-up mechanism.
This last photo is a bit out of focus--I really need to use a tripod instead of hand-holding the camera.