I have used Prezi for a presentation several years ago. After a 4 year gap I did have to spend some time relearning how to maneuver the site. I actually prefer Prezi to Powerpoint because it allows more creativity in how the presentation flows. I love the zoom feature and the surprises that can be added to a presentation with the amount of space that is available in one path. The most confusing part of the experience was customizing paths and trying to rework and delete content.