I saw the subbed version at the theatre.
it's a pretty decent movie with a fantastic soundtrack.
the plot was fun with some cool moments for the main characters, but every story beat is pretty much telegraphed with only one sort of pointless surprise.
the animation is fine. It's easu to see places they went all out and places they were trying to save a few yen.
Im not anywhere close to being caught up on One Piece and enjoyed myself, so don't worry about that.
if anyone has any questions or comments put them below i'll do my best to respond
And check out the soundtrack it's a masterpiece of an album