Satisfaction with treatment is regarded as an important outcome measure, but its suitability has not been thoroughly investigated in the context of shared decision making (SDM). The authors evaluated whether both patients' and physicians' satisfaction ratings differ between an intervention group and a control group within a structured tool for cardiovascular prevention (ARRIBA-Herz). In a pragmatic, cluster-randomized, controlled trial, 44 family physicians in the intervention group consecutively recruited 550 patients whereas 47 physicians in the control group included 582 patients. Main findings were high satisfaction ratings independent of group allocation in patients and physicians. Significant differences had only negligible effect sizes. Compared to global satisfaction ratings, the effects of the shared decision-making process are better measured by a more concrete approach representing different steps of this process. Further research should refine behaviorally oriented questionnaires that measure SDM and a version for physicians should also be created.