Just watched 28 Years Later at the theater. Really tense movie with some extreme scenes, I loved it. The atmosphere is very unsettling as you'd expect. Got captivated right away by the main story and the characters, I even shed a tear at some point.
However I might have found the overall pacing of the movie to be a bit odd. Also, the music is really good but it lacks a proper theme like 28 Days had.
I'm already planning my 2nd watch.