I feel just like Bruce_Hulme. At the moment I am one of the first lecturers at our university to test Prezi. Especially for teaching it is crucial that the presentation can be structured linearly. For the overview it is extremely important to be able to zoom out on the superordinate topic to see where you stand now and to which sub-theme you are going next. As long as I don’t have this freedom, I won’t recommend Prezi to our staff.