To be brutally honest this was a complete waste of my evening.
If you like witnessing a Shakespearian esque descent of two men into madness then you may like this movie, but for me it was self indulgent and boring.
The final scene for me typified the whole movie. Too many unsatisfactory unanswered questions, so many continuity errors and far too much use of unnecessary and indulgent scenes.
We came out of this movie with one pervading question - what was that all about.
Once again another movie over promoted and swallowed up by its own hype.
My advice. Don't bother