The most beautiful part about horror movies, the very essence is whether you've experienced that eerie feeling on a brink of "I just can't see it any further" and of course shivers. To summarize, this one delivers both. Couple of scenes are real, real creepy.
New words to the genre? Yes - I'm following horrors quite closely and still have found new tricks. Visual candy - yes, I've liked a lot the way camera played about dimensions, 3D-oriented scenes were also likable. Derivative to The Eye, Insidious and Re-cycle - also yes, quite unfortunately. But! I'd l-love to see more derivatives to Insidious.
Well, one can complain also about full-straightforward story, which is not so to say. So-so direction - here I can agree, but did you ever see stronger performance from teens in Asian horrors? (Pals, this is not a J-horror, it is from Thailand/Hong Kong) Not likely, so why complain too much?
I can mumble a while around longish scenes, but I can also cease it on the fact that this is quite typical for pan-Asian movie school and well, this is not a Transformers franchise anyway.
All in all this is a solid, quite creative 6/10 effort well worth watching for those who seek for new tricks on the horror arena. Give it a shot - at least to your exploratory agenda.