It's an excellent mix - vocals are in the front 'phantom' center rather than isolated in the center channel (like on Steven Wilson or Bob Clearmountain Atmos mixes), but there are discrete instruments all around including in the height speakers. I think it sounds great played in 5.1 as well.
There are already two songs from
Starfish available to stream in Atmos ("Under The Milky Way" and "Reptile"), but all that material remains under Sony's purview. I don't think anyone from the band was involved in those mixes.
This download release is the result of a collaboration between IAA and
Communicating Vessels Records, so it only covers albums they control. If there were to be another Atmos release (no idea if this is happening), I imagine it would be the new
Eros Zeta and the Perfumed Guitars album that came out a few weeks ago.