Our presenters used it at last month's DrupalCon in Chicago. On the plus side, you can build very quickly once you get the hang of it and not get sidetracked w

Our presenters used it at last month's DrupalCon in Chicago. On the plus side, you can build very quickly once you get the hang of it and not get sidetracked with a lot of formatting options. It's also nice to be able to flip to a non-linear mode where you can just click to whatever it is you want to talk about and not flip back through your slides. The zooming provides for very simple hiding and emphasis of points, including "hiding" extra content for future sharing (eg, embedding). The big downside is you have to be really careful with the panning and zooming. What seems like 'just a little' when your building can easily feel like an amusement park ride when it's on a big screen. Also, you can't upload to slideshare unless you record it as a video first. Overall, we were very happy with it, and the audience seemed to enjoy it. But you definitely want to build some practice Prezi's before doing the real thing. We found it very useful, but it has the potential to be very distracting if you aren't careful.