This actually came out in France last year (alongside a theatrical re-release of the restored film) and it really is an essential purchase for all Keaton fans (and all silent movie fans as well). The film has never looked better, and has been beautifully restored, and while it doesn't show Keaton at his funniest, it definitely shows him at his most inspired. The film is a classic, and feels much more modern (in how it is edited and filmed) than almost any other silent film I have seen.
While the film alone would be worth the purchase price, this disc is full of bonus features.
Buster Keaton Rides Again (a documentary about the making of the Railrodder) is actually more interesting than the film it is about, and it is great to see Keaton as himself.
The Iron Mule is an Al St John short film that features a "blink and you miss it" cameo from Keaton. This is a nice addition, and is a film most silent film fans won't have seen. And while far from funny, is a nice touch.
The Orson Welles "introduction" comes from an early 70s TV screening of the film where Welles tells (for eleven minutes) of his admiration of Keaton and this film. It is interesting and again a nice addition to an already packed disc.
Some of the features are just padding (not that any padding is needed) such as "tinted film", "restoration of the film" and "return of the general".
But without a doubt this is a five star purchase, and with a full Keaton collection promised for later this year I hope this is the first of many excellent Keaton discs.