The present study investigates the validity and utility of the German adaptations of the two short forms of the Big Five Inventory-2 (BFI-2), the 30-item BFI-2-S, and the 15-item BFI-2-XS, developed by Soto and John (2017b). Both scales assess the Big Five domains. The BFI-2-S allows, in addition, the brief assessment of three facets per domain. Based on a large and heterogeneous sample, we show that the psychometric properties of these adapted short scales are consistent with those of the Anglo-American source versions, and we demonstrate substantial convergence between the adaptations and the source versions. Extending the original scale development study, we demonstrate high retest stability of the scales and their facets. Our results clearly indicate the construct and criterion validity of the two scales: Both show substantial convergence with the NEO-PI-R domain scales. Moreover, the distinctive correlation pattern found between the facets of the BFI-2 and the NEO-PI-R could be replicated for the facets of the BFI-2-S. Furthermore, we show that the domain scales of both instruments are associated in the hypothesized directions with important life outcomes, such as life satisfaction and intelligence, and that the facets of the BFI-2-S have incremental validity for predicting these outcomes.