The intensity of this apocalyptical performance is not for everyday listening, and its power cannot be appreciated in a casual listening: it demands time (not only whilst the discs are playing, but for a considerable while afterwards) and attention. It was recorded live at a concert in 1981 (apparently with "patching" from rehearsals, though I defy anyone to identify where these occur) but there is no audience noise: at the risk of sounding "hysterical", it was one of those occasions where the rapt audience seemed to hold its collective breath whilst the work enveloped them.
There are more user-friendly recordings of the work - Klemperer, Barbirolli, Boulez, Bernstein (VPO or Concertgebeouw) and Karajan's own earlier studio version are all outstandingly good - but as a rare experience of this awesome, awe-filled, devastating Music, only Walter's Live recording from 1938 is this version's peer.