I just listened to the 5.1 Remix/Remaster of AMLOR for the first time on my Carver Ribbon + Klipsch Surround system and it was weird! They didn't just move the sounds around. It seems like they completely changed the mix in many places. I assume these were alternate takes in many cases (having made my own album it can be night and day using different takes and unused parts or leaving other parts out) or perhaps some are now much louder instruments that were turned way down before and vice versa. Some were interesting. Some were not as good, IMO. I'm going to try it next on my home theater system with a 17.1 channel upmix and see how it sounds.
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They need to get the guys that did the Atmos mix of Booka Shade's "DEAR FUTURE SELF" to do Atmos mixes of all the Pink Floyd albums. I bet they would be crazy interesting (maybe not better, but interesting). I can just imagine Piper at the Gates of Dawn in Atmos....