Very cool stuff as usual from J.T.
A few great set pieces like the shoot out in the BBQ park, the escape through the apartment back stairs and the last stand in the recycling field.
Johnny Hallyday as the lead is simply a fun and funky choice and the central conceit of "is there a need for vengeance if there is no memory of the initial crime?" is fudgin brilliant and deep in the way Johnnie To's best films can sometimes be. Plenty of good humor and cool interstitial games and ideas as well.