This just reminds me on how no one has made the killer app for all these sensors. It's just data, no one has shown me how to make myself better from all this data.
It reminds me of how, in response to the popularisation of the 'science' of graphology, schools popped up teaching you how to mimic the handwriting that a graphologist would associate with desireable personality traits.
Having gotten a fitbit for christmas, I was disappointed by the app. All this data, and they don't do any interpretation besides displaying a few graphs. The data definitely shows how my resting heart rate is affected y how many hours I slept, or how I exercised, etc.
Data (and QS generally) can't help you change your personality, your mannerisms, etc...but it might be useful in catching an underlying medical condition.