Answer: Early adopter
Explanation: Individuals or groups who buy into a company's product before many others are called early adopters. Early adopters usually get a feel of the product or services before it becomes popular having already experienced the benefit and shortfalls of the product or services before many other individuals within the community.
Being among the first set of users or consumers, product manufacturers and impending consumers rely on early adapters to provide update about product shortfalls and general verdict on product performance.