I watched this tonight. It was a stunning piece of work. I'm still sort of in a fog. It manages to be surreal, funny, deep, and powerfully emotional all at once. It's presented as almost a completely disjoint sequence of short scenes, that all somehow add up to something amazing. The visuals are incredible, and the acting is all top notch.
The use of music is just awesome. Mark Kozelek, who was the main guy in a couple of bands (The Red House Painters, Sun Kil Moon), and has been in some movies such as Shop Girl, provides some of the music here and it's just stunningly good. He has a cameo part as a musician in the movie as well. He was good to begin with but has deepened over time most definitely.
The story, such as it is, is of two old friends coming up 80, on vacation at a Swiss spa, and sort of coming to some crossroads in their lives. Michael Caine and Harvey Keitel both do wonderful jobs as the two friends. And there are various smaller parts. Rachel Weisz is very good as Caine's character's daughter and assistant.
Definitely recommended if this sounds like your cup of tea. If, like me, you are in your waning years, it's particularly poignant and powerful.
* BTW, a favorite song of mine from Sun Kil Moon, Salvador Sanchez. It's an amazing piece of work, though very different from the music he provides in the movie.