I don’t know this album well enough to comment on how faithful the Atmos mix is to the original stereo, but I’m really enjoying it. I might even put it ahead of some of the Scheiner 5.1 mixes, which aren't among his best work (IMO).R.E.M. fans have been spoiled by the Elliot Scheiner 5.1 mixes that are excellent and discrete. The Atmos mix of Murmur is nowhere as good as any of the 5.1 Scheiner mixes IMO.
The Atmos mix really uses the whole space, with Stipe’s vocal hovering between the fronts & front heights and the drum kit extending outward towards the side speakers. There are even some drum fills that go up into the height speakers, plus isolated acoustic guitar, piano, or organ in the sides & rears. “9-9” and “We Walk” were highlights for me.
Sound quality is excellent too, the drums in particular sound crisp and punchy. Fingers crossed for a 40th box with this mix on Blu-Ray!