The retail on the current versions of the same product is $5300, and that's not including the amplifier/electronics they're going to throw in. I'd say $850 is a steal if all in clean, working order. They're only 8 years old also.
I believe the Australian blu-ray version of Hacksaw Ridge was not an Atmos soundtrack, unless it has been updated (or perhaps UHD). Dunkirk, even though 5.1, sounds pretty amazing, especially the aircraft!
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