If you really want every piece of music from the film, incidental or otherwise, then I'm sure you can find a bootleg download. I have the Vesper edition on my computer which has a vast amount more music than this release, but in all honesty I prefer sticking this on. Why? Because it works as an album, and I think that's how Vangelis intended it. Blade Runner is my favourite film, and this is one of my favourite albums. If I want every track I am honestly better off just watching the movie again, so that the music can complement the visuals. Here though, the atmosphere of the movie is captured but each track stands up on its own merits. The lush saxaphone of Blade Runner Blues, the beautiful piano piece Memories of Green, the nostalgic One More Kiss. In a particularly nice touch the soundtrack doesn't end with the somewhat dated "End Titles" but "Tears in Rain" and Batty's wonderful soliloquy, beautifully capturing the essence of the movie.
I haven't personally listened to the latest, 3-disc release which seems to be garnering hostile reviews for still not delivering everything the fans want. Personally, I find that between this, the Vesper bootleg and the actual film I have pretty much all I need. But for a concise, intelligently arranged album that captures the movie's atmosphere and features most of the key musical (and narrative moments), this is a wonderful listen and at £7 very cheap for a soundtrack.