Diagnosis of a disease before the onset of symptoms can benefit patients in many ways. It can circumvent an exhausting investigative odyssey; it can inform reproductive decisions; it can help a patient to plan; it can allow him or her to connect with others with the same condition, which is not only reassuring for the patient but also helpful to research scientists. But it can also cause despair. To what extent is information about an unpreventable genetic disease that has not yet caused any symptoms a gift and to what extent is it a burden?