If you are looking for an excellent HK suspense movie, look no further: The Suspect is exciting from the beginning with the voice over full of feeling, through the chases to the action packed gunplay ending. You will never be bored, the story is unusually good (it is not a ripoff from Assassins as my friend Stefant21 stated in his review) and the pace is high. The beginning of the movie is not slow paced, as one reviewer stated, there is a lot going on throughout the whole movie but it is true that most of the gunplay occurs during the long and excellent ending.
If you are only looking for gunplay and explosions you will be disappointed. Don't expect a so called heroic bloodshed movie even though the theme of friendship and loyalty is classic to the genre (see for instance The Killer). The Suspect is not so exaggerated as the movies of John Woo, the action and everything else in The Suspect is more realistic but you will still see some blodsquibs.
The Suspect is masterfully directed and the acting is superb in spite of the fact that the actors have to speak a lot of english instead of only cantonese. For those of us that have seen him before it comes as no surprise that Simon Yam manages to make a big impression even though he is not on screen very much, but I was thrilled that the rest of the cast is also unusually good. The characters are multi layered, they are not cartoon figures either black or white and even the ruthless Simon Yam seems to have something good in him, he is not only ruthless and bad. The tone is serious throughout the movie, we don't have to suffer through any ridiculous HK humor. 10/10