Scientists are increasingly expected to share their research with the public using learner-centered strategies that build trust, such as engaging in relationship-building activities. A growing number of science communication training programs have been developed to address this need but little is known about whether and how scientists value such programs. In this paper we examine scientists' experiences with the STEM Ambassadors Program (STEMAP), a science communication training program that aims to build relationships for open-minded exchange between scientists and the public. We discuss benefits and challenges for scientists when using the STEMAP model for public outreach.