I saw this movie for the first time on DVD after seeing some clips online feeling somewhat intrigued. I knew of this flick in 2010 but for whatever reason I didn't give it the time of day (more fool me in retrospect) and when I got round to watch it fully I was not only blown away by the story but the score and the cinematography.
What I find rewarding about this movie is that it doesn't try to oversell the vampire aspect and I don't think they could have chosen anyone better to play Abby than the unmatched talent of Chloe Grace Moretz. I will further add that it was this movie that made me fan of her acting as she was able to make me feel sympathy for a vampire, which is not an easy thing to do when you consider that role can be a natural antagonist role as opposed to a protagonist. She has superb chemistry with Kodi Smit-McPhee's Owen as they have some common ground as they're both lonely with no one that understands them.
I like that the viewer has to work out what Abby is in the beginning because the makeup and prosthetics for her vampire form is very subtle and less is more look as opposed to what Hollywood has gone with in recent years with the whole morphing heads motif (we can thank Buffy the Vampire Slayer & Dusk til Dawn for that). And even then the vampire scenes are used so sparingly in this flick as it pays more attention to the friendship that turns into a young romance between Abby & Owen.
Chloe gives what I can only describe as a very honest performance as someone who has seemingly found someone that she can be open and vulnerable and is having a hard time trusting herself to trust Owen (if that makes any sense). Same can be said with Kodi as he gives a very believable performance of an outcast that just wants to have a friend and not feel like he has to watch over his shoulder due to the malicious mistreatment he suffers at the hands of some sociopathic bullies.
If you're looking for a vampire story that offers a very fresh and alternative to the Twilight franchise, then I would STRONGLY recommend giving this a look as it's one movie that will make you think.