Decent watch, probably won't watch again, and can't recommend.
Don't get me wrong, I like the movie, but it is HIGH concept, low execution, despite being a beautifully produced and shot flick.
Nicholas Hoult and Kristen Stewart carry the movie, and for those haters Stewart is playing a girl that is not supposed to show emotions so there, but there are some solid actors in support roles as well: Guy Pearce (Memento), Bel Powley (Carrie Pilby), and David Selby (who I thought was Alan Alda from MASH: This was like a Mandela effect: I had his voice in my head.)
There just isn't a lot that is actively interesting to watch a movie where everyone is a robot without emotion, but it is a cool concept, especially when it becomes a survival concept. People who can't manage their emotions as if they don't have them get sent to a place where they're basically electro-shocked into committing suicide if they hadn't beforehand.
The tension of it definitely ramps up a bit, but the focus eventually becomes more on the romantic connection than survival, even during a part primarily focused on surviving.
The last couple of scenes are really subtle too, I actually had to re-watch them to just to make sure I knew how it ended.
So while I like it and there is definitely something to like here, I think less people than more are going to be into it.