This concept is not new and has been done many times, such as Vantage Point (2008), Deja Vu (2006) and more appropriated like the tv series Seven Days from 1998-2001.
As with any new movie that is based on a previously known idea, this one does introduce a few new ideas aspects and is presented extremely well.
There are no scene transitions. The editing uses straight cuts between shots, however as the action progresses the camera tracks the action (actors) smoothly and efficiently. Panning is very smooth and consistent. Thankfully there is no ridiculous shaky camera work.
This film is a pleasure to watch.
The plot is very thin at the start as you're trying to work out the story, however as the story progresses the plot becomes a little more interesting. The film concludes with an interesting ending.
There is not much time spent in the story to identify how the concept works, or what technology was used/developed to provide such a scenario. This doesn't detract too much from making it an interesting movie though.
This is not very clearly defined, as all other repeats clearly result in an unfavourable outcome.
The only acting that was a bit stiff are from the officials running the organization.
The concept of the film is interesting and it continues the theme that has been seen in previous releases such as DejaVu and Seven Days. The ending is difficult to grasp as it certainly makes more new questions than it answers existing ones.
The characters are developed enough that we have enough information about each character to either like or dislike them, plus they are sufficiently competent to carry out the tasks we see them perform.