early adopter

early adopter

 

http://en.wikipedia.org/wiki/Early_adopter

 

an early adopter or lighthouse customer is an early customer of a given company, product, or technology.

 

Typically this will be a customer who, in addition to using the vendor's product or technology, will also provide considerable and candid feedback to help the vendor refine its future product releases, as well as the associated means of distribution, service, and support.