Overall, it's a logical system that stays faithful to how proper cameras work, and it's essential for creative control, but compared to physical dials it's still very tricky to hit good manual settings quickly or in response to changing conditions -- not least because the preview of the shot is obscured by all the dials and, well, there's just so much tapping.
ENGADGET: Samsung Galaxy Camera review: a 21x compact shooter brought to life by Android