First listen: it was a summary/scan listen of some of the subtle and some of the bombastic portions of the album. I listened then, to the 5.1 mix. Anyway, I very much prefer the dreamy immersive mix of the Atmos to the stark immediacy of the 5.1 mix. And by dreamy I think I mean much less digital, more analog-sounding, maybe even slightly rolled off for the better. By immersive I mean the distribution of sounds is much more inclusive to the listener, with lots of great effects having more real estate within the dome, whether that be horizontally or vertically, but mostly both. Also, the Atmos version may even be a db or two light on LFE, but the balance of sound is very very good, regardless.
Yes, the cash register effect at the beginning of Money is interesting. In the 5.1 it begins in the center channel then ping-pongs to the other four bed speakers. In the Atmos version it starts in surround left and then proceeds to ping-pong to surround right and the two main fronts, no center, no return to surround left. Also, in the Atmos version none of those effects bleed upwards. No big deal, maybe they shouldn't (coin is heavy?). But if that's the only complaint (and it's really not one) then so be it. Overall, a great experience.
I have now listened to the bluray Atmos and 5.1 mixes, and the Apple stream (again). The stream is a bit compressed (doh!) and that is unfortunate, as I think the "dreamy immersive" quality of the TrueHD does not hold up when streamed..it's too rolled off for my taste.