The first replay had some FPS problems, but the shader switch made up for it, it looked very nice.
The second replay was a bit akward, since you only slowed down to sync with two beats at the start, but after those you synced the slowing down to every beat ahead, and it made the start look like it was off sync.
The sync at the reply aroud 0:18 was awesome, it was almost flawless.
Some of the transitions lacked imagination though.
Overall, a very nice video, I want to see it finished.


EDIT
3000th post, hurray