This film is not perfect. It's not as cinematic as the Ron Howard movie, it's somewhat 'slow' for our standards, but I still think it's worth watching and I enjoyed it.
It's like a crossover between documentary and fiction. This film focuses mainly on the efforts that surrounded the four lead British divers rather than that group itself. A lot of room is given to the Thai people, to the support divers, to the logistics.
The story is definitely not told with an epic tone, but has a rather realistic hue to it. If you're interested in the story, and you've already seen The Rescue and Thirteen Lives, I think this is a nice addiction. It gives you bits and pieces of extra information. It works better after watching those two, rather than as stand alone film.