Although this is a valuable record of a memorable production (the great Russian film-maker Andrei Tarkovsky's only operatic staging), purchasers of the DVD should be warned that the picture quality is absolutely diabolical.
It was sourced from a PAL video recording originally made by the BBC, but for some reason (presumably US/Japanese sales) the DVD authors decided to convert it into the NTSC system, which plays havoc with the picture definition. Worse, the low-bitrate transfer has added digital artefacts galore, which get particularly blocky every time the camera pans or zooms.
Thankfully, the sound quality (either PCM stereo or DTS 5.1) is vastly superior, and the set as a whole is clearly a must for Mussorgsky fans and Tarkovsky completists - bad though the picture is, it never completely obliterates the virtues of the original. But it's a real pity that corporate greed has made this such a badly compromised product, as I can't see a separate PAL DVD appearing any time soon.