I love Tarkovsky and looked forward to viewing "The Sacrifice" after having seen Andrei Rublev, Solaris, The Mirror, and The Violin and the Steamroller. After first viewing, I found the picture confusing and hard to grasp. But, unlike "The Mirror," on subsequent viewing I realized that the reason that it is confusing and hard to grasp is that Tarkovsky has created a self-indulgent film based upon the amalgam of two different scripts that he had written. I don't think that he himself was clear on what he wanted to say, and I don't think he was concerned if the viewer is clear either. Perhaps this is because he knew this was his final film? Once again, though, the graphic images in the film are stunning, and his use of light, shadow, and reflections is genius.
But what makes the DVD eminently worth purchasing is the documentary "Directed by Tarkovsky" which is added as a bonus feature. The documentary shows the making of "The Sacrifice" (which does shed a little light on what he was trying to say) and it's fascinating to watch Tarkovsky at work. The documentary also includes interviews with him and his musings on life, death, and filmmaking.