User interfaces which adapt to user tasks, behavior and preferences are expected to be better than non-adaptive interfaces. However, so far few data is available to quantify the effect adaptivity has on usability and user experience. In this paper, we analyze this effect for a professional geographic information system. In a closed-group between-subject experimental design with expert users, we compared an adaptive and a non-adaptive version of the system with respect to effectiveness, efficiency, and attractiveness. The results show that a smart adaptation of the information presentation can increase effectiveness and efficiency as measures of usability, but did not significantly affect user experience.