This movie kick-started many things. The very fruitful partnership between John Woo and Chow Yun Fat, the successful career for of them, the heroic bloodshed movie (don't try this at home or let kids watch them) and a lot of imitators! So one should be really thankful to Tsui Hark, because it's a really good thing he couldn't direct. Otherwise we most likely wouldn't have any of the above!
But being as it is, you can watch this movie and see how it is done correctly. Replacement Killers eat your heart out! This movie still is superior to imitators such as the named one or a few others. Yes I know that some have argued that it is dated and other movies (such as Matrix) have not only copied some of it's styles, but improved them. Not for me, they haven't! Because it's not only about copying a slow motion effect here, it's about the story too. And the characters and their believes. And of course the acting!