Just got back from seeing at a local "IMAX", not one of the proper 70mm ones but a big screen none the less, and as others have suggested see this film in the biggest screen you can locally. (Wasn't until reading this thread that I was made aware that the local IMAX isnt full IMAX otherwise might of made more of an effort to go to the printworks in Manchester.)
Thought film was incredible. Not quite like anything I've seen before, guess that was due to lack of dialogue. Sort of felt like it was just happening in front of you rather then been told a story. Very difficult to explain so excuse me if that doesn't make entire sense!
Audio was a real standout, the first gunshots took me by suprise and was very visceral. The sounds of explosions and gunshots are very intense and really got the full immersive effect of surround sound.
Thought the 3 timelines functioned very well and was for me easy enough to follow.
The dogfighting scenes were top notch, albeit with some artistic licence but doesn't diminish the experience of the film for me.
Overall would encourage anyone who enjoys Nolans work or war films to go and see it! Don't think my TV and bluray will do it justice so glad I saw it at the cinema
Does leave you with a feeling of awe as to how the operation was completed and the bravery of the people who were in civilian vessels heading into warfare to rescue the troops.