I was one of the lucky ARMYs to see it in the theater, my friend got us tickets as a surprise. It was an amazing movie and experience.

I really loved this film, mainly because you get to see so many behind the scenes (lol) type of stuff when they're on tour. I found it to be really fascinating. They show pre-show prep, after concert celebrations, how they spend their free time on tour (song writing, relaxing, shopping, etc.), and you get to see the hardships of all of it (injuries, fatigue, emotional exhaustion). It really feels like you're there with them through it all.

You also don't necessarily need to watch the YouTube Red series to follow or understand anything going on. My friend, who isn't much of an ARMY and hasn't seen hardly anything about BTS other than MVs, really liked the movie.