The film is great - sparkling with wit, thought-provoking, and with original idea behind it. While not exactly representative for Nicolas Roeg's style (it's lighter in tone and with many humorous elements), it's a wonderful classic, highly recomendable.
The DVD edition, however, rates one star at best. No subtitles are provided, and the transfer is awful - watchable, but really poor. Like one other user wrote - looks like a bad VHS rip. After watching the film and deciding I want to permanently keep it in my movie collection, I went on to download the movie via torrent, and only then did I get a decent quality copy with subtitles on top.