This dramatization of the facts happened on July 20th, 1944 is the best ever filmed.
The acting is solid, the story is there and the sense of awe and terror is truly felt by the viewer.
With solid German actors like Wolfgang Preiss and Maximilian Schell in the lead roles, it is no small wonder that this 95min. Film is the better one of the bunch.
Another detail to be considered is the fact that this movie came out in 1955, barely 11 years after the facts and therefore memories of the actual facts must have been still fresh in the minds of the authors and filmmakers, as well as those who managed to stay alive after the war and in one way or another, either participated, or knew about the plot to assassinate Hitler (which by the way, was one of the many, and not the first one at that... nor was it the last.).
I can only recommend this buy. The image quality is average for the transfer, but still acceptable for such a movie, while the sound is exceptionally clear and crisp.
In my opinion it is a must buy option... up to you and your own taste to see if you, like me, will enjoy the movie, but beware younger generations, it is in "glorious" black & white, not color...