Evidence which demonstrates a link between the affective dimension and satisfaction in a tangible product based context is well documented. However, when placed in a credence service context the role of Affect becomes more complex. Previous research in this field has assumed consumer homogeneity when there is increasing evidence of consumer heterogeneity. This research attempts to address this by examining affective reactions to service encounters between two groups of respondents, one with the ability to make performance assessments about the service and one without. Findings suggest consumers of differing sophistication will vary in the way they form expectation and performance assessments about the technical, functional and affective components of credence services and that consumer sophistication may have a moderating influence on affective reactions evoked. This in turn has implications for the design and delivery of service offerings within such contexts.