very nice
yes, i thought the beginning was really slow. I understand that section was supposed to create dramatic tension, but when everything is consistently moving at slow motion, you kinda lose the feeling of suspense as opposed to "hmm, he's picking up his cigarette... he's still picking up a cigarette..." you could have shown the stuff happening to the guy on the ground moving in slow motion as if to show things in his mind blurring to a crawl, but keeping the standing guy's actions at normal speed to convey his feeling of security and victory.
That being said, any doubt i had on the movie (the relatively simple plot was part of it), it was all blown away by the climax, which was so absolutely perfectly timed to the music I was really impressed. All the rotating shots especially were very well done, which surprised me a lot. Obviously you know how to create fast scenes, so I guess I hoped the beginning was just as visually extravagant even if it needed to be slow-paced.
I'm really a lot more impressed than I let on, I just wanted to offer constructive criticism. By the way, I noticed the Cube-style clothing of the guys ;).