The original Star Trek looking and sounding better than I imagined it ever could. I'm often amazed at the intensity of color and the clarity of sound.
I won't go into detail about the content of the show. It's original Star Trek! We all know it. Thoughtful sci-fi for adults with a brilliant premise, incredible characters, mind bending plots. (Most of the time.) I'll instead focus on the bluray's quality and features:
The image is of course not as clear as recently filmed blurays. But it is still great looking since the series was filmed on 35mm film. There is often deliberate "softness" to the image, due to the style of cinematography at the time to make everything look ethereal and glamorous. But the vast majority of the footage looks brilliant. Also the show was originally lit with a kaleidoscope of color and it is displayed magnificently here.
The sound is noticeably better than I've ever heard on original Star Trek. You can catch every word without the static hissing we often hear on older shows.
The bluray gives you the option of watching each episode with either the original effects, or the updated digital effects, as well as various audio settings. The current DVD editions only provide the new effects. The new effects are not terribly intrusive, but they are not at all consistent either: some shots look great and some look like a demo for a video game.
There are a few nice special features, but for the most part they're lacking for a show this iconic. Most of the features from the original DVD sets have been carried over, except I believe for the text commentaries. Instead we have "Starfleet Access", pop-up picture-in-picture commentaries from the writers and producers, as well as the Okudas, technical advisers to the sequel shows and all around Star Trek historians who wrote the original text commentaries on the DVDs. There is also a pop-up trivia track but for the most part it's quite annoyingly condescending as it's an "in-universe" explanation of some of the show's details. But this is only available on 3 or 4 episodes. There are also a few interviews with the stars and writers recorded in 2004 for the original DVDs. Another new feature is 8mm "behind the scenes" footage captured during the series' filming. One entire disc is devoted just to "The Trouble With Tribbles" and includes an episode of the animated series and a Deep Space Nine episode also dealing with tribbles, as well as a detailed retrospective on the making of that clever DS9 episode.
At the time I bought this Best Buy was offering it for just $29.99, which is less than the DVD version, and less than anywhere else.