if you go into this thinking it's about time travel or about universe swapping and nothing else, don't bother. It has been trashed because critics and lots of viewers seemed to completely miss the underlying theme of what drug addiction can do to.
Very uncomfortable, insightful, and even though I wished it had ended four minutes earlier than the actual end, I thought it was a very brave commentary on the drug epidemic raging in America. Brilliant performances by Hayek and Wilson especially.