We explore how entrepreneurial passion’s effect size varies across measures and operationalizations. The role-based measure outperforms the dualistic measure on some outcomes but not on performance. The role-based measure’s IPF and IC dimensions are strongly correlated, and so are its three domains, putting its theoretical assumptions in question. Scholars often use it against the guidelines, although the obtained effect sizes do not drop. The dualistic measure is more effective when the original questions are used and when entrepreneurship-specific targets are mentioned. Yet, its focus is not positive feelings per se. The search for an ideal passion model should continue.