I spent about 15 minutes browsing the site. I liked the fact that it was a fairly small web site containing the home page plus material divided into 4 parts (one part per page), with a few additional pages - glossary, tech info, links. Good quality of content, easy to use. I think it would be a valuable addition to a high school or college science course.
Easy to use provided the user's browser supports the animations. Author did provide a choice of formats for the animations. Several links to external sites no longer work.