How I Use It
I would not use this site. I think if you are going to lecture it makes more sense to use PowerPoint (less time, easy to transfer the file..etc).
This site takes a good amount of time to learn how to use. It is a glorified PowerPoint lecture. While students can use the site to summarize information and post resources on a topic, there are many other easier options to do this (PPT, Google Docs or Presentations to name a few). Also, the flying in and out seems to be kind of a "gimmick" to me and eventually the engagment that comes from the look of the site will fade.