I've got it, and love the Atmos. Honestly I only bought it for the Atmos track, to add to the 3d disc as a custom job. Gravity with 3d and Atmos is awesome. Being a quiet movie, not overpowered by loud rich avalanche of sounds (effects and music) like say comic book movies, you can appreciate the spacial displacement. To be honest so many movies make Atmos of little value as so much sound is coming from every speaker there is zero nuance.
I've watched it twice in the last two years. I'm in Australia though so not sure I can help. I'd lend you my copy.
BTW, I got mine Amazon Canada after the US edition disappeared. If has a different UPC code, 883929436231. Maybe also search for that.