Even with all that, the movie plays on concepts of the origin of life, god, alien life, technological advancement, human reliance on computers, and the possible dangers of artificial intelligence. All of this makes for ripe debate now 50 years past the movie's release. It is unique in the fact that it does not really try to provide any answers, or really set up all of the questions that it is posing all that well. It is not a movie that you can really have on in the background and follow everything, yet there are parts where you can completely ignore it and not miss anything.
The 4k set is a three-disc set. The movie looks great in 4k UHD format. On the UHD disc, you just get the movie, with or without the option of playing the commentary track with actors Gary Lockwood and Kier Dullea. It is hard to tell exactly how great the restoration is until you see the low-definition clips from the movie on the special features disc (which is a separate blu-ray). While it does not look as good as some of the new movies do in 4k, given that it is now over 50 years old, it looks as good as it will ever look in any format unless it gets an extensive restoration. That said, the A/V transfer was of good quality and it is a step up from the DVD and the initial blu-ray releases. There is also a regular blu-ray disc with just the movie itself on it.
There are about 2 hrs worth of extras, some of which were documentaries shot in the 2000s which discussed the movie's impact on all the sci-fi movies that came after it, and how it was a giant in the world of practical special effects. There was also some behind-the-scenes material shot while the movie was being made, a documentary from back when it was being filmed about how the filmmakers and NASA were working together to make it as authentic as possible, and for me, the most interesting, how they thought technology and the space program would be in 2001 as opposed to what reality has been. They got some very close (like the tablet devices on the ship that look a lot like iPads do today) and other things that were way off about (like permanent bases on the moon, and space flight being as normal as flying in an airplane). There is also an almost hour and twenty-minute long audio interview with Kubrick done in 1966).
Overall, I cannot say that this is a movie that everyone will enjoy. Chances are, however, anyone who is considering this has already seen the movie and is a fan. I would say, that it is a good idea to also get 2010 which was the sequel that was made in 1985 which not only concluded the story but also helped make the story in 2001 make more sense than it does upon first viewing. It is also, in my opinion, a more entertaining movie than this one, because it is less thought experiment and more drama. Even though I do like 2010 better, this one is still one of my must-watch movies.