This has to be viewed in a little context. The original is a TV production, recorded live on the 5th December 1991 - the 200th anniversary of Mozart's death. Being a TV production from 1991 the picture is a little 'foggy' in comparison with a modern production. This however is of little importance with what is essentially an historic document with both conductor Sir Georg Solti and soprano Arleen Auger both no longer with us(tragically early in the case of Auger).
As for the sound, I must part company with the other reviewer - for I find it to be superb in every respect - the ambience of the venue captured to wonderful effect - whether on the PCM Stereo or DTS 5.1 Surround soundtracks (believe me it is there). What is not there is a Dolby Digital 5.1 soundtrack - so if you don't have DTS you'll be limited to stereo.
That stereo soundtrack, however, is essentially identical to the Decca CD of the event - and where the TV picture may have aged somewhat, Decca's sound most certainly has not. The DTS is nice, bringing out the ambience further still - yet retaining the clarity and body of the sound.
As to the performance itself - the achievement is very high - Arleen Auger is ethereally beautiful in the soprano part, nicely counterpointing the vibrant urgency of Cecilia Bartoli in the alto part. Vinson Cole is the tenor, a pleasing voice with a suitably beseeching tone. The bass Rene Pape is excellent - on the lighter side of bass rather than lugubrious. The chorus and orchestra are predictably excellent under the experienced hand of Sir Georg Solti. This is one of my favourite recordings which I would highly recommend.