I originally bought Superman The Movie, Superman II: The Richard Donner Cut and Superman Returns on HD DVD, and those satisfied me for a while - but I knew I always wanted the sequels, Superman III and Superman IV The Quest for Peace (a guilty pleasure of mine) on Blu-Ray. When the chance arose to get this at a decent price (including shipping it was around $35), I couldn't refuse to get this 8-disc box set.
The first two films are spread across the first four discs - that is, theatrical cuts and then Richard Donner's versions. Superman III is disc five, Superman IV is disc six, Superman Returns, disc seven, and an eighth disc which has the fantastic documentary chronicling the history of Superman in film and television - both George Reeves and and Christopher Reeve get a moment of silence from mentioning their passing.
The set is exhaustive - of particular interest to me was the inclusion of the Fleischer cartoons, of which I watched many times as a youngster. As far as I can tell they are in high definition as well, and they look beautiful. Also included in the first episode of George Reeves' Superman show from the 50s, as well as a never-aired/never-released/completely frightening "Adventures of Superpup" pilot.
The only thing missing from this set, that even though it wasn't a Christopher Reeve movie, was Supergirl. Mentioned in some of the documentaries, its exclusion is a bit perplexing, as it was made between Superman III and Superman IV. Hopefully a standalone release will come in the future.
The set is worth every cent for Superfans and with eight discs worth of material to watch, including theatrical versions of all the films and expanded/director's cuts of the first two, including commentaries on all except for Superman Returns, this is a set that will take a good while to work through. Highly, highly, HIGHLY recommended.