Who would use a wearable?

Samples of users through the product life cycle...

Gadget Geeks (like me) - Innovators

I'll wear one just because it is cool cut edge technology....
Market size - 1,000's

Tech Savvy Executives - Early Adopters

Executives who are on the go and need information quickly and all the time. These are people who forced Palm devices into the corporate world. They are willing to be inconvenienced by a new input method and by carrying around an extra electronic device.
Markets size - 10,000's - 100,000's

Soldiers - Early Adopters

These users' life depends on information and is very willing to be inconvenienced by a new interface, packaging, applications, input and output devices.
Market size - ???

Field Technicians - Early Majority

Forman, warehouse workers, or machine operators who are constantly on the move all day, but need information constantly on a real time basis.

Doctors - Early Majority

Access to patient records while doing round, paging system, confidential access to patient records