As commented by another user, it starts as a bank robbery movie, and turns out to be a slow-paced story on the interaction among the characters ... and very few action sequences. Just bear in mind that it is a drama, not an action movie. Judged as a 80s Hong Kong movie, it is a good one.
Just one complaint: My VCD of this movie has only Tony Leung on the case cover, and Ti Lung on the back cover. But actually, Ti Lung, not Tony Leung, is the main character.
It is a very subtle movie. It reveals to me what life really is, or what life could be at least for some people, in Hong Kong public estates. Despite some adverse conditions, people can still have a happy and positive life.
If you are accustomed to those formulaic plots in Hong Kong movies, be prepared to the unexpected twists. They are unexpected not because they are unusual. They are unexpected because we have been accustomed to unusual and unrealistic plots. Real life there is not that dramatic, but can still be very touching.
The movie, maybe intentionally, also misleads the audience by presenting stereotypical characters and then reveals subtly more about them, giving depth to them. They may not be merely what they first appear to be. Don't jump to conclusion and judge the characters easily ... and don't jump to conclusion and judge others easily.
Despite the slow pace, the movie really need to be watched attentively. Many things are told by body language and environment, instead of having the characters telling us directly what happen.
Last, I like the English title. It fits the story much better than the Chinese title.