Really good watch, would watch again, and can recommend.
While it may not sound like the most original concept, it definitely feels innovative. Using isolation to add atmosphere to the movie allows the movie to really focus the terror of infection, as opposed to zombie movies where it's usually about flooding the world with zombie infection.
The movie has a great layered metaphor of Darwinism sliding from a might-makes-right attitude to having to be smart to survive.
The experience really felt full for them being trapped in a convenience store. The cast did an excellent performance through the graduating series of events, and a rather strong story.