Holy Cheeseballs...
Hmm, well normally I use this space to tell an artist what he/she can do to improve upon their work, but who the fuck am I to tell you anything when you make something this kickass? Well technically, the only thing I found "wrong" with the piece was the stiff movement of the female character, but it's a small worry... and I wouldn't want you to change your style...
The pros, which greatly outweigh any cons, are of course the violence and the sound effects. The first time I watched this, I thought there was a little too much noise, but I realized it adds to the atmosphere of chaos and panic... though why anyone would want to enter a place like that is beyond me. I know we'll see the whole point in the final version, which I hope equals the overall quality seen in the Teaser...
Keep up the great work; the entire staff deserves a round of applause for taking Flash in this direction and rivaling the heart-pounding excitement in some of the high budget action movies out there. So says Dr. Manhattan...