I'm going to be a ditto head here and say that Danton's review below expressed how I felt about the film, and better than I could have expressed it.

This is romantic comedy at its best. I can't exaggerate the wit and intelligence on display. The writing is excellent; Lau Ching Wan is Lau Ching Wan; Carina Lau perfect; even Louis Koo and Gigi Leung turn in positive performances.

It will make you laugh and teach you something you don't know about the opposite sex.