I went into this movie with no reservations and was pleasantly astonished by it. I advise anyone else to do the same; it is not like the Matrix, it is not like Hitchcock, it simply exists in its own right.
The film attempts to be at least two movies in one. Unlike numerous attempts in the industry, it succeeds elegantly. I was drawn into the first part, the character portrait of the wealthy, shallow young man who undergoes a startling change... and then found myself swept up in a keenly sympathetic, psychological suspense film. Part of the success of the story is that it is centered primarily around several young, uncomplicated characters. In Hollywood, such characters in suspense films are usually knifed up within the first few pages of script.
I don't look for anything positive in the upcoming American remake, incidentally. This is a film with depth and yet simplicity, truth and fantasy. It is a pure pleasure to watch, and it simply can not be improved upon without becoming gaudy and confusing.