Can't supply any details as I saw it on HDNet, although there was an almost constant rumble for the first 10-12 minutes which recurred intermittently the rest of the way. Wouldn't call it reference quality, but it is as good or better than a number of others on the list. At least it kept my sofa vibrating (Buttkicker). Bottom octave bass was used effectively to subtly establish a foreboding mood, although there is the occasional big boom as well.
Not a movie for those with little tolerance for convoluted plot lines, unclear motivations, and illogical or unresolved details, though.