I've been a huge fan of the original Star Trek series since my pre-teen years, and I bought the DVDs when they first came out. I was disappointed then because they didn't do any clean-up at all, they just straight transferred the old film to DVD. I'm much happier with the quality of this set. It looks great on my 4K TV. I like the versions with the updated special effects, although those fancy updates do tend to look a little out of place when they switch to the live action on those cheap 60's sets. What I didn't like was the audio - these are oddly quiet, especially for Blu-Rays. To hear the dialog I have to crank my speakers up to the point where they're hissing, and it's entirely annoying. Why put so much effort into the video and then put it out with terrible audio? I don't understand.