_shadowstorm_
Each version of Acheron has some tracks which really shine. Mechina deserves credit for letting the compendiums complement the originals, rather than replacing them - the originals are different, but in the case of acheron, just as good.
The little irregularity at the end of Halcyon Purge is just genius, it's a shame it's hard to hear on the compendium version.
Favorite track: 5. The Halcyon Purge.