Re: the questions on the suitability of DW in ambient light situations.
I agree with what many have said about DW not working well in high ambient light situations. However, for high brightness content, e.g. typical sporting events, DW works very well in controlled ambient light environments. I have ceiling cans back from the screen (6-10 feet) that I can run at 50% and still have a VERY satisfactory picture. Even 100% is usable in a pinch.
Most movies, especially the darker ones that seem to be the current rage, will always do better in a fully light controlled room.
I looked at several of the Wilsonart grays (ever bought a sheet because it was cheap) and concluded for my purposes that DW was the best choice.