What they have done to the original film negatives of this TV series is almost miraculous. They have cleaned it up so well that it looks as though it was originally made for DVD, without (and here's the important bit) taking anything away from the original material. To see how well it has been done, just take a look at the trailers (which haven't been cleaned up) or the mini documentary on disc 1, which shows side by side comparisons. If they hadn't done this work, I would have been very disappointed with the quality, but the finished product is absolutely superb. Even the theme music (both versions) has been re-recorded using the original manuscripts, together with some of the people who worked on the originals, so apart from the quality of the sound, it would be very difficult to tell the different versions apart. My only disappointment and it is a very minor one, is that Kirk's famous opening lines sound a little too quiet (strange though, the voice sounds fine in the mini documentary). This wouldn't be enough to knock even one star off my rating though. If you are a fan of the original Star Trek, you won't be disappointed with this.