Objective: With akteonline.de a patient owned Electronic Health Record (EHR) has been implemented that combines both data from clinical information systems and data entered by the patient. In addition the EHR supports information exchange/communication controlled by the user. The EHR thus offers the potential to place the patient into a more empowered position. This impact on patient empowerment and the implementation of additional features is to be investigated. Additionally, the user satisfaction is to be evaluated regarding patients' acceptance and utilization of the system. Method: Users were divided into three groups, two of which received different training on the functionalities of akteonline.de. A quantitative study employing an online-questionnaire and considering all registered users was conducted. Results: Users evaluated the internet based system to be feasible and the navigation to be suitable, yet additional training for users regarding particular features seems to be required and also for hospital staff in general. The proposed add-ons were approved of. The study also showed positive effects on patient empowerment.