This two DVD set is the best version to buy of this film. The remastering/restoration is excellent, so the picture quality is superb. The film itself needs little introduction, it wasn't the first Italian/European western, but it was the first that tried to be different from the standard US western.
Based on Kurosawa's Yojimbo (1961), this is the film that changed Eastwood from a little known American TV star of the early 60's into a movie Icon. Eastwood wasn't the first choice for the part, there were 4 or 5 preferred actors in front of him. But Eastwood was prepared to work considerably cheaper than these people and made the movie for $15,000.
All of this and more is revealed in the excellent commentary by Sir Christopher Frayling on disc 1. Having the commentary makes this version essential as Sir Christopher is THE expert on Leone and Eastwood.
I haven't even mentioned disc 2, well this contains documentaries and the usual stuff you associate with special editions. However there are two reasons to buy this version of the DVD. 1. The Film. 2. The Commentary.