In this paper, a "flipped classroom" approach is evaluated using three different datasets. We use student evaluations of the "flipped classroom" in particular, in addition to regular course evaluations and exam results for the past three years in order to allow for statistical comparisons. Overall, the results are quite positive. Among the interesting effects, students report that they prepare better for lectures, are more satisfied with the course overall, and achieve slightly better grades. In particular, fewer students receive very low grades. On the one hand, we argue that our results support more experiments with technology to improve education. On the other hand, we also hope that our analysis could be useful as a reference for evaluating such experiments and new approaches.