This study focuses on a third-party perspective of idiosyncratic deals (i-deals). More specifically, we look into the differential judgments co-workers make about i-deals in their work environment, as well as their reactions. Based on equity theory, we examine to what extent the content of the ideal and the work context (i.e., the functional dependence between co-worker and i-dealer) explain co-worker judgments regarding i-deal fairness in addition to subsequent voice behavior (i.e., complaining and/or requesting compensation). A vignette study with 1,988 respondents shows that when i-deals are considered distributively unfair, co-workers try to restore equity through voice behavior, thereby making the i-deal less effective. Furthermore, i-deals spark more distributive injustice perceptions and voice behavior in a highly interdependent work context. Finally, on average, financial bonuses were considered most distributively unfair and, thus, trigger more voice behavior. These results have important implications for i-deal literature as they uncover the criteria that co-workers use to judge i-deals and shape their reactions.