Ok, I'm going to post more later when I have time, but just wanted to give a quick first impression.Dark Detailer
-- There is a definite improvement in black levels and detail in dark movie scenes, and dark sections of video games. Things are not just darker, but you can actually 'see' better. Plus, the black bars on top/bottom of the screen when watching letterbox content are also darker, which helps them fade away into the background and causes the content area to pop a little more.
And from what I can tell, it's always ON, including "Game" mode, and regardless of 'picture' mode or temperature. I could not find a way to disable it, but I did not enter the service tech menu. It did not create any lag, and I played a wide variety of games.
I did not notice any issues with scenes going from bright to dark, or dark to bright quickly. For that matter I did not notice any abnormalities with the Dark Detailer at all. Blacks were deep and dark without getting crushed, and things did not feel artificially enhanced. Everything looked and behaved natural. I still need to try the strobe-light scene from "Silence of the Lambs". Unfortunately I could not find my copy last night, so I will look for it when I get home tonight.
I did notice a couple strange things happen with both 737/837... when watching a letterbox movie, there were a couple scenes when light/images would actually show in the black bars, almost like the content was leaking, or spilling over. Both sets exhibited the same behavior in the same scenes. None of them were too distracting, but it was odd, and did momentarily take me out of the 'zone'. What's that about?
Anyway, I have only good things to say about Dark Detailer. It gets a thumbs-up from me.
However, for about 80% of what I watched or played.... tv, movies, games, and normal full-screen viewing, the 2 sets looked exactly the same. The 737 looked every bit as good as the 837, and I could not tell them apart. It's only during those dark moments, and letterbox bars, that DD really shows it stuff.
So, I guess the question remains... is it worth the extra cost...?? (EXAMPLE: 65-inch at Frys: the 737 is $1400, the 837 is $2000, = $600 difference
Everybody will need to decide that for themselves. I'm not sure yet myself. More testing to come...