watched it over a friend's place Saturday night. what really impressed me was the fact that most of the stunts (minus the life threatening ones, of course) were done without strings and fancy effects. that and how they trained the main actor, who was a Korean pop star, to do alot of the stunts and moves in only 3 months.
can't really say i was impressed by the CGI, though. it really ranged from bearable to just UGLY. still, if you want an action movies with crazy stunt work, you could do alot worse.