I got the 2 disc set (final cut + dangerous days) and I'm totally satisfied with it. The movie is spot on perfect, and I have no interest in seeing the versions with voiceover after seeing a clip on the second disc with them. I felt like laughing when the VO came over after the Tears in Rain speech, it ruins the best part of the movie. Awesome awesome movie and seeing this definitive version first makes me not really care about what came before.
The doc is great too. I would have loved to have had more of Harrison but it's to be expected that he doesn't say too much here. The idea of Tyrell being a replicant was pretty cool but, I think, would have just been a meaningless twist. If Tyrell isn't Batty's "father" it kind of loses some of the impact of him being killed.
There were a couple of samples from this movie that were used in Paul Oakenfold's the Goa Mix that I had forgotten came from this movie. Where Deckard is giving coordinates to his TV computer with the Vangelis score in the background.. wow that was so cool to unexpectedly see. And the tears in rain speech, holy shit, that was a perfect moment. It felt like the movie was ending there.
The last 20 seconds or so were just so perfect. After the "tears" speech it felt like the movie had passed its climax, but the energy level shot up so rapidly at the absolute last minute. So awesome.