Double Vision is definitely one of the best Asian horror films I've seen in the last few years, and definitely the best out of China/Taiwan.
A dark film with a good storyline (though yes, the last part of the film is a bit hazy), and excellent characters and actors. A real unexpected pearl, far better than what I had expected from promotional material when it was first released.
A very refreshing change to the usual Korean/Japanese/Thai ghost films, it is genuinely frightening without being deliberately gratuitous.
The temple scene mid-way through the film remains my favourite scene, so fast and well done that you're left utterly shocked by the time its over.
For a good dark supernatural horror film, or for something completely different to the increasingly done to death Asian ghost/horror film with long black haired ghosts, see this one.