I agree with much of what you wrote Armand, except:
Originally Posted by Armand07
Just one more word about viewing angle, I have a 4 piece row with my 2.40 screen. The outer seats are at the edge of the screen. With the Black Diamond there are no issues with the viewing angle in this setup whatsoever. You have to go even wider to experience a little drop in brightness, but also that is quite acceptable.
(Assuming you use the .8 gain version that you referenced).
When you say "no issues" with your viewing angles on the BD to be more accurate it would be "I don't notice any issues."
There certainly will be visible hot-spotting from seats near one side edge of the screen on your BD screen. The side farther from you will be darker. It's physically impossible with the BD screen characteristics for that not to be the case - that's how it would measure objectively and it's very visible to folks like me (having seen these screens many times and checked out that specific characteristic of the BD screens).
I'd see it in a few second in your set up, guaranteed.
I only bring this up because, throughout my own exhaustive research in putting together my home theater, screens were probably the most problematic choice. Going on most people's reports was almost useless in one sense: I lost count of how many times I would read about a certain screen "There are no visible sparklies or screen texture" or "I don't experience any hot-spotting or viewing angle issues with this screen" only to encounter those screens in person and see those problems in spades.
I am rendered dumbfounded that anyone would miss the hot-spotting on these screens, let alone not see it when looking for it.
Which is why personally viewing screens, especially if you find yourself picky or sensitive to screen artifacts/hot-spotting, is definitely the best way to go if possible.
And, as I always say: none of that is to actually put down the BD screens since, otherwise, I find they are great at what they are made to do - maintain contrast in challenging conditions. All screens have compromises, the BD screens are not unique in that regard.