Steve Jobs never met a focus group he liked, but many folks find that interaction with users is crucial to creating a better product. For me its more about the type of product I am creating. If I am trying to create something that is a fundamental revolutionary change to a market, then it’s less about what users think they need and more about what they don’t know they need.
Regular, deep interaction with your customers gives you the information you need to make powerful decisions about what products to roll out, what features to include, and in what format it will best be received. Fan/customer/prospect engagement makes all marketing activities more efficient.
Source: Personal Branding