Privacy issues aside, this is a great improvement over existing technology. This would really help with, for example, monitoring chronic conditions like hypertension. Instead of having to manually record and report blood pressure to their doctors, people could have it recorded and reported automatically. Speaking from experience, most people are lousy with that.
Tracking my health, and what else?
I would, however, like to build a skin-mounted radio. Would cut down on the gear I have to carry on long bike treks.