There is no chance you should ever buy a ALR screen if you actually have a properly light controlled theater space. Stewart, Dalite, and Draper will all tell you to get a white screen instead of a ALR screen in a theater. This is because a properly treated (DARK!) room will do the ALR control for you. If you say you don't have a problem with ambient light, then spending more on a band aid, that you don't need, isn't going to make the image better.
ALR screens tend to introduce both hotspotting, sparking, and image uniformity issues. These are things which can be overlooked if you are in a bad room with a lot of ambient light. In a sports bar. At the boardroom table with big windows off to the side. But, in a blackened home theater, you are better off (by a mile) spending $1,000 on a screen, then dumping $1,000 in dark paint and dark carpet, then spending an extra $1,000 on the Epson 5050, or going to a JVC projector which can deliver a far more stunning image overall than the Epson 4010 can deliver.
ALR screens are a patch to a bad room. The cure in not a $3,000 ALR screen, it is $20 in paint and some good shades.
If you absolutely can't control ambient light, then an ALR screen is still going to be a tough call because it will degrade image quality. Then, after dropping so much money, people love to justify how 'great' the image is, when they really are just ignoring the actual issues. I've literally had people tell me that while they do have sparking, hotspots, and image uniformity issues, it's all worth it... That's a very personal decision, but it's important to know that these are real issues, and reviews of the screen certainly indicate some of these same issues.
