With this recording - John Culshaw's penultimate for Decca - the 'sonicstage' concept reached its apogee: I can't think of another opera recording where the production is so 'interventionist' - not afraid to go right over the top where necessary (just sample the beginning of disc 2 to see what I mean) and with incredible use of echo and perspective. Even if you don't like the music, this would make an excellent stereo demonstration disc!
But the music is what it's all about: Elektra represents Strauss at his most 'out there' - he was never this musically radical again (Rosenkavalier, though just as good in its own way, represented a change of direction) and Solti delivers the maximum amount of drama in a score which, strangely, he often claimed to be equivocal about. His conducting, and the playing of the VPO, has an almost visceral impact here and Nilsson, Collier and (particularly) Rysanek, give performances that you will never be able to forget.
I'd definitely say this is one of the finest opera recordings ever made.