Kind of review for stable (1.0.0) version.

Installed it about a week ago and... uninstalled it tonight.

Pros:
+ really smooth UI transitions
+ kind of faster boot up process
+ smooth and fast keyboard layout switching

Cons:
- video playback stutters really bad

Yeah, only one negative moment. But it was enough for me to uninstall it, 'cause I watch YouTube videos pretty often.

I can't say that default (without FasterN9) video playback is perfectly smooth, but FasterN9 really worsens the situation. You can test video playback performance on this two videos: http://www.youtube.com/watch?v=7HKoqNJtMTQ and http://www.youtube.com/watch?v=vjIwmJMqrco (stuttering is more noticeable in the second video). Open them with something that uses default system videoplayer (like cuteTube).

EDIT:
Also, it seems that idle battery consumption increased by ~ 4mA during this week.